Archive for the ‘Field Notes’ Category
The first Tortolita BioBlitz was a huge success!
On Saturday November 19th, 46 participants made almost 700 observations of over 135 species!
The first Tortolita Preserve BioBlitz was a huge success! What a great way to share and explore this amazing open space!
We held seven small group outings during the BioBlitz, and all the participants enjoyed getting a chance to explore with guides from Arizona Master Naturalists, Arizona Game and Fish Department, the Coalition for Sonoran Desert Protection, and Tortolita Alliance. One of the guided walks headed by CSDP’s Jessica Moreno focused on identifying animals by scat and tracks. Species identified included Grey Fox, Mule Deer, Bobcat, Coyote, and even the tiny and industrious Kangaroo Rat! Another walk conducted by Jennie McFarland from Tucson Audubon Society and Steven Prager from Audubon Southwest yielded a list of fifteen species including a Ruby-crowned Kinglet; the first time this species has been documented here on E-Bird. Another highlight was the identification of Gregg’s Nightblooming Cereus happily existing in the understory of a Palo Verde.
In addition to the outings, many people worked hard collecting observations on their own. We had several people visiting the Tortolita Preserve for the first time and others new to iNaturalist making a big contribution to the success of the event. Identifying observations made by others is another area in which our group really contributed. We had people making identifications during the BioBlitz. This is such an important part of the outreach component of iNaturalist, so a big thanks to people who worked on identifications!
Check out the project:
Tortolita Preserve Fall BioBlitz · iNaturalist
Reducing Roadkill: Safe Passages for Wildlife on Interstate-10 East
By Jessica Moreno, Conservation Science Director
One of the best things about doing roadkill surveys is watching the sunrise. During the monsoons, the sun breaks across the eastern horizon and lights up the moisture laden air and morning cloud cover with light and throws the foothills into brilliant color. The sun feels hopeful and the day new. The second-best thing is knowing that every datapoint is helping us make things better.
The 20-mile stretch of Interstate-10 (I-10) between Vail and Benson, east of Tucson, Arizona, divides the regionally important Rincon-Santa Rita-Whetstone Mountains Wildlife Linkage. This wildlife pathway is one of only a few – somewhat safe – crossing points across I-10 found between Tucson and New Mexico, and it encompasses several protected areas and important waters, including Davidson Canyon and Cienega Creek, making it critically important for desert wildlife in the face of climate change.
This wildlife pathway is protected partially by federally protected lands including Saguaro National Park, Rincon Wilderness, and Las Cienegas National Conservation Area. Pima County has invested in securing additional conservation lands in this linkage as mitigation under the Multi-Species Conservation Plan (MSCP), including Bar V Ranch, Cienega Creek Natural Preserve, Rancho Agua Verde, and Colossal Cave Mountain Park, which are managed under the Cienega Creek Management Plan.
However, I-10 cuts through this area of wildlife movement, resulting in more wildlife-vehicle collisions for large animals such as black bear, mule deer, whitetail deer, javelina, coyote, and mountain lion, as well as smaller species like box turtles, opossum, Antelope jackrabbit, white-nose coati, raccoon, badger, and bobcat. It also serves as a potential movement area for jaguars and ocelots. Existing culverts and right of way fencing are not currently adequate at reducing wildlife-vehicle collisions or ensuring safe wildlife passage in this area. Future growth and increases in traffic volumes will only worsen the frequency of vehicle-wildlife collisions.
Since 2006, several qualitative assessments and reports have been produced that highlight the area’s importance for wildlife movement, but there has not been a study that has collected data to build a high accuracy model of wildlife movements and roadkill locations along this corridor. With the lack of such a product, nothing has been done on the ground to reduce wildlife-vehicle collisions and to improve safe wildlife passage by employing effective mitigation structures like winged highway fencing or wildlife overpasses. The Coalition for Sonoran Desert Protection, in conjunction with partners, is spearheading the effort to collect data to provide the information necessary to make this stretch of I-10 a safer passage for both wildlife and people in this important corridor.
In the spring of 2017, CSDP conducted comprehensive assessments and wildlife surveys of the nearly 80 existing concrete box culverts and metal plate pipe structures between milepost 277-302 (Houghton Road to SR90), with participants from several government, nonprofit, and community partners, including the Arizona Game and Fish Department, Cochise County, Pima County, Tucson Audubon Society, Sky Island Alliance, Defenders of Wildlife, and the Wildlands Network. Our results indicated that this wildlife linkage could be made safer for wildlife and motorists by 1) installing wildlife funnel-fencing to keep animals off the highway and to direct wildlife toward existing crossing points; 2) retrofitting and widening existing drainage culverts located in high volume areas; and 3) construction of an additional wildlife crossing between Cienega Creek and the railroad underpass near Empirita Rd Exit 292.
Roadkill surveys were part of the next phase of this effort: to gather data on roadkill hotspots, together with wildlife passage rates using wildlife cameras in the best existing culverts. We hope this data will inform State and County highway and wildlife officials on where to focus mitigation efforts to improve highway safety and minimize wildlife-vehicle collisions with site-specific wildlife funnel-fencing installation, existing culvert retrofits, and new wildlife crossing structures. Our results illustrate the need to implement changes and provides baseline information to evaluate the success of future mitigation measures.
Our Desert Roadies project began with a team of volunteers to help collect wildlife-vehicle mortality data on Interstate-10 between SR83 and SR90, east of Tucson. Desert Roadies volunteers worked in teams of 2-4 people, including myself, to conduct driving roadkill surveys. Observations were recorded by our notetaker with the GPS coordinates. Surveys were conducted in the morning, starting up to 30 minutes before sunrise, every week for 6 weeks during the monsoon season in 2019 and 2020, beginning in July, except when conditions were bad for visibility or driving such as rain, dust storms, or other low visibility weather. In addition to these formal roadkill surveys, we collected other data on iNaturalist.org from community members and personally investigated reports about black bear mortalities. We also requested ADOT records on reported animal-vehicle crashes in the study area. This data was analyzed separately.
Due to the onset of the Covid-19 pandemic in March 2020, carpooling with volunteers was no longer a safe option. So, we adapted as best we could by canceling the planned spring 2020 survey and having another monsoon season survey instead, which was conducted by myself and my family, Eddie Moreno (who is also a biologist experienced in roadkill surveys) and my two toddlers munching on donuts and “helping” look for animals from the backseat. This survey was done when the state was under curfew and lockdown, resulting in reduced traffic volumes. This likely was one reason for fewer observations of roadkill during this survey window.
Walking surveys are the ideal method for complete and accurate data. But safety concerns eliminated that option because we are using volunteer participation and this is a busy interstate highway with narrow right of ways. Therefore, the roadkill survey portion of this project was designed to be a broad-brush stroke only and we anticipated a small sample size. Recording categories of small, medium, large animals and/or by clade (reptile, bird, small/med/large mammal) are adequate for our purpose. Because of the project design, we have near zero detectability of small animals, and instead our target species are deer, bear, coyote, bobcat, gray fox, javelina, and those larger animals that the Arizona Department of Transportation consider most hazardous to drivers. The data will hopefully serve to provide a preliminary look at potential roadkill hotspot areas. For best accuracy 1) our GPS units had a one-button click to mark points quickly, 2) volunteers could also use maps and mileposts to confirm locations, 3) we analyzed the data in 1-mile segments, which better informs the fencing solution strategy and somewhat addresses imprecise location information, and 4) a staff biologist was always present to provide corroborating identification.
We completed two monsoon survey seasons for roadkill observations in 2019 and 2020, resulting in 78 data points of at least 14 different species. We were able to detect animals as small as a rock squirrel or cottontail rabbit. Skunks, raptors, and deer were not identified to specific species. All of our deer mortality observations (n=2) occurred between mileposts 296-297, near the Pima-Cochise County line. A hotspot of roadkill observations occurred between mileposts 291-295 (between Cienega Creek and Empirita Rd), in an area that coincides with a gap in available culverts and crossing points, and near several culvert locations between mileposts 283-287.
I-10 has been identified as a significant barrier to black bears in southern Arizona. In 2011, Todd Atwood et al published a study describing I-10 as a more significant barrier to functional gene flow for black bears than the U.S.-Mexico border, identifying I-10 as the dividing line between the Border subpopulation of black bears to the south, and the White Mountain subpopulation to the north. In our study area, these subpopulations meet and Romeo and Juliet romances unfold, ensuring healthy black bear populations in Arizona and in Mexico. For black bears, I-10 may be a barrier to gene flow as well as a “population sink” due to wildlife-vehicle deaths. This could pose a significant issue for the Border subpopulation, which additionally faces barriers to movement at the U.S.-Mexico border due to the construction of the border wall and other border-related infrastructure such as roads and lighting. Without safe passage both north of I-10 or south of the border, our southern Arizona black bears are at risk of genetic isolation and disappearing all together (what we call extirpation).
We have gathered four records of black bear mortalities in recent years, and three of these are verified with photos. These records indicate that the bears attempted to cross I-10 by following higher elevation ridgelines closely associated with the two largest underpass structures at Davidson Canyon and Cienega Creek. We also have animal track and camera trap data showing successful passage under I-10 at a few specific culverts. Most of our observations show bears moving south. April-May and August-September appear to be peak periods of activity for black bears in this area according to our data.
Black bears are just one example of the impact I-10 is having on native wildlife. In addition to large animals like bear, deer, and jaguar, smaller animals are at risk as well. Saguaro National Park has been monitoring a disturbing decline in “lost carnivores” over the last decade, including skunks, foxes, and badgers. Biologists are also concerned about the local disappearance of smaller range habitat specialist species affected by habitat fragmentation, including box turtles, Antelope jackrabbits, skunks, kit foxes, badgers, and white-nose coati. Increasing wildlife connectivity conditions for black bears and deer should allow struggling populations to repopulate from connected habitat areas and also benefit a wide array of other species.
With the data we’ve collected, we have solid evidence to back up the need for funding wildlife funnel fencing where it is most needed and make the case for new or improved wildlife crossings.
Read CSDP’s final project report to Arizona Game and Fish Department here.
(Please note: Photos of roadkill animals are included in the report)
Want to help?
Although collecting information on roadkill is not for the faint of heart, the data it provides is valuable. In the future, CSDP will be looking to continue our Desert Roadies program in more areas. In the meantime, folks can also document sightings of wildlife on roads in Pima County at https://www.inaturalist.org/projects/csdp-safe-passages.
This work was made possible thanks to the time, effort, and skill of the following volunteers: Matt Clark, Sami Hammer, Bruce Jacobsen, Ken Lamberton, Eduardo Moreno, D’angelo Padilla, Raynor VanDeven, Althea Weeks, and Daisy Weeks.
We also want to thank Scott Sprague, Jeff Gagnon and Brit Oleson of the Arizona Game and Fish Department, and give special thanks to our collaborating partners: Myles Traphagen with The Wildlands Network and Brian Powell with Pima County Natural Resources, Parks and Recreation.
This project was funded in part by the Arizona Game and Fish Department Heritage Fund.
Diary of a Desert Identifier: Welcome to the Neighborhood or the Saga of the Clever Rodent
By Gay Russell
Being a Desert Identifier means going through large files of photos captured on a disc from the desert cameras. The photos have usually been taken over several days, usually a week to 10 days. You quickly begin to see the site as the same as any neighborhood, populated by certain characters (species) and some visitors. The neighborhood usually has some mule deer from the local resident herd, a herd of javelinas, the occasional coyote, a lone grey fox, roadrunners, skunks, the lone bobcat, and other interesting characters.
Recently I was fascinated with the saga of a plump, clever rodent and a local grey fox who was determined to capture the rodent!
The grey fox appeared, sniffing and digging at the area—he just knew the rodent was there!
Each time, the rodent would reappear after the fox left the scene, still safe and happy.
After watching several unsuccessful hunting sessions by the fox, another neighborhood character joined the scene—-a ringtail!
There were 9 attempts by the grey fox to capture the elusive clever, plump rodent. The ringtail attempted 8 different times to enjoy a meal that would include the rodent—to no avail. After over 1500 photos and a period of 10 days, the rodent was last seen at photo #1500—-still triumphant!
The saga continues . . . .
(I’m still King of the Mountain!)
Field Notes: a nest of great horned owls
By Gay Russell
During the over twenty years I have lived in Sun City Oro Valley, we have had several sets of Great Horned Owls nest within our area. In 2017, a pair made a nest in one of two large trees next to a golf cart path on the edge of the golf course and close to a major street. Because of the location, I was able to document the progress of the owls.
One of the parents was spotted outside the nest. The first shots of the nest revealed fuzzy shapes of owlets; but not the exact number. A few days later, a single owlet was observed, peeking over the top of the nest.
As the owlets grew, they ventured out of the nest and it became clear that there were two owlets. Shots of what are apparently some of the first ventures out of the nest were captured. A parent was always on watch! And, later, good close-ups of the owlets were taken.
It was a privilege to see the owls develop. Even though the location was very close to a busy golf cart path and a major street in our development, the owls seemed to realize that they were safe within the area and would not be disturbed. I felt fortunate to be able to document the process.
Thank you, Gay, for sharing this story and photos with all of us!
Amor from the Desert by Mely Bohlman
This piece was written on the stolen lands and waters of the Tohono O’odham and Yaqui/Yoeme.
Imagine yourself standing in the Sonoran Desert on a caliente summer day. Let’s paint the landscape by adding deep blue for the mountains that emerge in every cardinal direction and strokes of brown that create texture on the ground, the structural limbs of plants, and fill every crevice on this landscape.
You may feel the dusty, sturdy earth beneath your feet, the same sweeping surface that clouded the vision of indigenous ancestors’ eyes as they navigated through these desert lands. You may observe the occasional desert breeze that moves through your body, swaying nearby palo verde trees and breaking up the lull of the endless heat.
As you take a step, you might have a gentle creosote bush tapping you on your shoulder with its branch. It is full of waxy leaves and fuzzy globes from its flowers resembling planets in an out-of-focus telescope. Down in the wash, a catclaw acacia may have pulled on some fibers from your backpack, leaving a mark from its thorns that will remind you to watch out for it next time. You may see the sprinkles of desert confetti left behind from the blooming party that was hosted by the yellow petals of brittlebush, the red torches of the ocotillo, the pale-orange drapes of the globemallow, and the pink rays of starlight from the fairy duster. You make eye contact with a broad-billed hummingbird darting across- maybe spotting a flash of vibrant blue-green and blue-turquoise hues on its’ body and neck.
You may notice with only your ears the sounds of the desert spiny lizards scrambling through rocks and fallen mesquite tree branches. The cooing of the white-winged dove becomes your steady metronome, giving you the tempo, rhythm and heartbeat of the desert as the day unfolds. White-winged doves, you see, are warm and feathered fragments of saguaro flying in the desert- as the white-winged doves synchronize their migration with the reproductive cycle of the saguaro and maintain an asymmetrical ecological interaction.
The sweat beading up on the back of your neck feels cool, despite the powerful Sonoran Sun, beating down on your head. You may decide to seek refuge by stepping into the long and narrow shadow of an elder saguaro.
Field Notes: a rare sighting of a clay-colored sparrow
By Ken Lamberton
On day 218 of the Pandemic, my daughter Jessica and I hike in black masks south along Speeden Wash to her wildlife cameras under the I-10 culverts in the 3000-acre Empire Ranch. She is here for her research project documenting the migrations of bear and mountain lion, bobcat, badger, and coati by using her tracking skills, roadkill surveys, and 36 cameras and 14 volunteers. I’m here for the birds.
Last summer, I listed two dozen species, including several raptors and the tiny, gray desert-riparian warbler with the rufous rump and crown named for the daughter of a nineteenth-century ornithologist and the first curator of the Smithsonian Institution. Lucy Hunter Baird, an expert naturalist and scientist in her own right, came from a family and history of strong, independent, and intellectually curious women. Which isn’t surprising to me. I’m surrounded by such women.
This morning, trailing behind Jessica, I count the birds on one hand. A pair of cactus wrens rattles somewhere unseen. A curve-billed thrasher becomes mesquite shadow. The desert is cool and quiet—quiet, at least, until we reach the freeway. While Jessica pulls the memory cards and changes batteries on cameras we previously glued to the concrete culverts, I search for Lucy’s warblers in the usual places but find none. Despite the one in my yard last week—a first-ever and number 129 on my Bisbee yard list—I imagine most have already made the fall journey back to southwestern Mexico.
When she finishes and we hoist our packs, a small sparrow lands in the sand in front of us. I see a rusty crown and think juvenile white-crown sparrow, another common bird, but snap four pictures anyway. Species number five for the day.
Then I’m off to Willcox and the Twin Lakes Golf Course to check out the shorebirds and a recent rare bird report of a greater white-fronted goose while Jessica heads for home in the opposite direction.
This evening, as usual, I download the day’s photos and begin deleting them—mostly scores of images either out of focus or of something I don’t recognize or remember. Why did I take a fuzzy picture of this white-thorn thicket? The joys of digital technology. When I come to the sparrow at Speeden Wash, my finger pauses over the delete key. I enlarge the image and see that it’s not a white-crown. Maybe a chipping or Brewer’s sparrow? But the lores—the tiny spaces between the eye and beak—are pale. And the cheek patch looks well defined above a dark “mustache.” The breast feathers seem buffy, almost the color of clay…
With rising excitement, I post two blown-up pictures of the sparrow to my birding friends on social media and get an immediate response: Clay-colored Sparrow! A rare transient in Arizona and a species I’ve never seen before: Life Bird #437.
Updates from the El Rio Riparian Preserve
By Janine Spencer-Glasson, Friends of El Rio Preserve
The Santa Cruz River serves as an important resource for migrating birds in the southwestern United States. Migrating birds depend upon riparian habitat more than any other type of habitat in Arizona. There are several links along the chain of stopovers for migrating birds on the Santa Cruz River. One of them is the El Rio Preserve in Marana. To date, over 240 species of birds have been identified at the Preserve (go to ebird.org and search in Hotspots for El Rio Open Space Preserve to view the complete list of birds).
El Rio Preserve is a 104-acre property located along the western bank of the Santa Cruz River. The site has a long history of human use; it is located at the northern end of the Los Morteros Archaeological site and was occupied from approximately 850-1,300 AD. In the 1960’s, a gravel pit was created there to provide material to build Interstate-10. Later, it was used as a disc golf course. In addition to the Preserve’s role in providing bird habitat, the Preserve also serves as a link between the Tortolita Mountains and the Tucson Mountains, allowing wildlife to access water and move about.
This site has flooded periodically over the years, and water tends to remain ponded for six months or more, with periods where it is completely dry. This has created intermittent habitat for birds that need a site with surface water. Throughout this time, birders knew the spot as the “Coachline Gravel Pit.” Occasionally some interesting avian species would appear, including blue grosbeak, grey hawk, peregrine falcon, white-faced ibis, osprey, belted kingfisher, Bell’s vireo, Inca dove, and hooded orioles, to name a few.
During a major rainstorm in 2014, the soil berm was breached between the gravel pit and the Santa Cruz River, and water filled the property almost completely, creating a beautiful lake and much buzz among people familiar with the area. Rare birds showed up, like the white-fronted goose, a white pelican, and plenty of ducks. Birders flocked to see the new lake’s avian inhabitants, and the parking area often hosted out-of-state vehicles. This prompted the Town of Marana to take a new look at what was now called the El Rio Preserve.
There were many problems at the Preserve, however. During storm events, invasive weed seeds and huge patches of trash would flow in and settle in the basin. Mosquitoes would breed where water remained under spots of dense vegetation. Much planning and work was needed to create a riparian site that would be an amenity to the neighborhood, while maintaining a natural state for birds, wildlife, and nature-lovers.
Improvements at El Rio Preserve have been a collaborative effort. The Town of Marana dedicated funding for design and implementation of riparian restoration. The Arizona State Forestry Department researched the area and wrote a comprehensive Forestry Management Plan that focuses on invasive species. Pima County and Marana extended the Loop Trail and constructed a parking lot with a ramada. Marana worked with a University of Arizona student, Alex Stoicof, to create a community survey, which identified riparian restoration as the top priority for the Preserve. She then designed a preliminary landscape plan. Marana has constructed a viewing deck, a water fountain, toilet, and interpretive signs, and planted native landscaping
Environmental education is an important element of the El Rio Preserve. Michael Bogan, Professor at the University of Arizona, has led a damselfly and dragonfly viewing and provided information and photos for an interpretive sign at the Preserve. The Town is coordinating with the Marana Unified School District and classes of students have toured the site and focused on science relevant to their studies. Boy Scouts have volunteered, putting up bee boards and bird boxes for kestrels and brown-crested flycatchers.
Tucson Audubon Society supplied plants and members helped plant a pollinator garden at the entrance to the Preserve. Bat Conservation International provided agaves and helped volunteers plant them. This spring, the pollinator garden was in full bloom, with butterflies, hummingbirds, and bees enjoying the gaillardia, penstemon, native salvias, desert marigolds, and other flowers.
The Friends of El Rio Preserve group has been formed to include neighbors and a diverse group of members from other environmental organizations. Friends of El Rio Preserve’s mission is “to promote wildlife habitat and connectivity in this beautiful, diverse natural area, so residents of all ages and interests can enjoy this urban oasis,” and we have planted pollinators, helped with weeding, and provided input on design elements and on interpretive signs. If you would like to learn more about Friends of El Rio Preserve, you can find us on Facebook or Instagram. You can become a Friend if you are willing to roll up your sleeves, join the team, and make a vital contribution to enhancing and protecting El Rio Preserve; contact Kathy at email@example.com or Janine at firstname.lastname@example.org.
It has been wonderful to see so many organizations and volunteers work to create a beautiful spot for people and birds!
Currently, more improvements are underway. Pima County Flood Control is in the early stages of constructing bank protection which will cost nearly $1.9 M (nesting bird and archaeological surveys have been completed prior to ground disturbance). The bank protection is designed to allow overflow connectivity with the Santa Cruz River during large rain events. Bank protection should be completed by this fall. There is currently no water flowing into the Preserve while bank protection is being constructed.
This fall, Marana will construct a connection to purchase water from the Cortaro-Marana Irrigation District and create a permanent pond approximately 5 acres in size. The Town is currently in the process of building an island to provide a safe place for birds to wade and rest once the pond is filled. The Friends of El Rio Preserve looks forward to assisting with pole planting native trees such as cottonwoods and willows and seeding other native annuals and perennials on the island.
Come visit El Rio Preserve once construction work is completed – you will be surprised at this lush natural site in the heart of the Sonoran Desert.
Monitoring results from the Tangerine Road wildlife crossings
Did you know that there are now five wildlife underpasses under Tangerine Road?
As part of a larger project to improve Tangerine Road, five existing drainage structures were enhanced and improved to better accommodate safe wildlife movement across this popular roadway. This is a cost-effective way to increase connectivity across roadways that is less visible to the general public (as compared to a wildlife bridge) but still very important. Construction was completed on these wildlife underpasses in Spring 2018 with the cooperation of the Town of Marana, Pima County, the Regional Transportation Authority (RTA), Arizona Game and Fish Department (AGFD), the Coalition for Sonoran Desert Protection, and other members of the RTA’s Wildlife Linkages Sub-Committee.
Starting in 2010, the AGFD completed pre-construction monitoring using roadkill surveys. After the underpasses were completed in Spring 2018, the AGFD started a 3-year post-construction monitoring project, including roadkill surveys and monitoring wildlife use of the crossings using wildlife cameras. According to an April 2019 progress report from AGFD:
Between May and September 2010 5,152 road mortalities representing 88 species were documented, helping to identify hot spots for future implementation of fencing and wildlife crossing structures.
[Using this data], the objectives of this construction project were to:
- Increase the size of five drainage structures and modify inlets/outlets to accommodate medium-sized mammals.
- Add funnel fencing at the crossings.
- Conduct habitat establishment evaluations, for three seasons, beginning one year after project completion, to determine whether any adaptive management measures are necessary to improve the effectiveness of the wildlife crossing structures.
Post-construction roadkill surveys began in Spring 2019. An April 2019 progress report primarily includes data from wildlife cameras installed on the underpasses and can be found HERE. A few data points and photos from the report are highlighted below:
Data has been analyzed to January 7th, 2019, this represents two full months of monitoring data for all five structures. A combined total of 1049 crossings by 17 wildlife species have been documented across all 5 structures to date. Coyote, javelina, and bobcat constitute the most commonly recorded species with 475, 365, and 130 crossings respectively, representing 93% of all documented crossings.
This is exciting news for wildlife in the Tortolita Fan and motorists along Tangerine Road. With the inclusion of wildlife fencing on either side of these five underpasses, wildlife are now being funneled to cross Tangerine Road under the roadway, leading to increased safety for wildlife and motorists.** We will share new monitoring results from AGFD when they release their next progress report on this project sometime in the next year.
Thank you for supporting connected wildlife linkages and wildlife habitat!
**Some observant community members have noted that this wildlife fencing is shorter than the wildlife fencing along Oracle Road. Why is this? The Tangerine Road wildlife fencing was designed for the medium-sized mammals that are most likely to use these smaller culvert wildlife crossings.
Badger, badger! New badger photos and data from our wildlife cameras
For 10 years we have had wildlife cameras on the landscape monitoring important linkages. We first captured photos of badgers in 2012, and they have made consistent, if rare, appearances since. Badgers are an understudied animal in Arizona and we know very little about their status in Pima County. We now have a total of 40 images of badgers across 19 camera sites, with a 27% occupancy rate (the number of cameras that detected badgers versus the total number of cameras out there). We have seen badgers at two sites in the Tucson Mountains study area, and at 8 and 9 sites West and East, respectively, of Oracle Road in Oro Valley. Our partners at Arizona Game and Fish Department confirm that one of the badgers we photographed crossed the wildlife bridge, moving east to west, earlier this year. We are diving into the data to learn more about them in our Sonoran Desert landscape, including a fun look at identifying individuals!
We thought you would enjoy these photo highlights, and a neat look at our preliminary results showing more badger activity during new moon nights than full moon nights. Why do you think badgers might be more active on new moon nights than full moon nights, when it is darkest? Badgers are nocturnal, although females may come out in the day with her young in Spring. They are also fossorial carnivores, meaning they live most of the time underground and are very good diggers. Most of their prey live in burrows as well, including ground squirrels, pocket gophers, packrats, kangaroo rats, and rattlesnakes. Badgers may be appearing on our cameras more often during the new moon for a variety of reasons. One possibility is that badger activity is correlated with prey activity, and conditions that increase hunt success. Are rodents are more active during the dark new moon than the brighter full moon, too? Can badgers, adapted to hunting at night and underground, sense their prey better on dark nights? In science, the best answers lead to more questions!
Many thanks to Pat and Henry Miller for contributing three badger photos from their own camera to our study.
If you haven’t heard it, you may enjoy Petey Mesquitey’s song “The Coyote and the Badger” on KXCI radio!
In wonder of bighorns and tortoises
by Jessica Moreno
Calypso is a healthy desert tortoise of about 25-30 years and a tortoise on a mission. He was named by a caring, bright 7-year old, whose family found him on their front doorstep no less than three times – after several kindly reminders to return to Big Wash and to stay on his side of the street. When they called us, I was eager to meet them. Arizona Game and Fish biologists joined me and placed a tracker on his shell using special putty, offered him a drink, and we returned him with ceremony once again to Big Wash, carrying him low as we crossed back over the street. Calypso was trying doggedly to travel east, but instead of using the very accessible wildlife underpass, he was taking the open high road: climbing up a rocky embankment, crossing the busy neighborhood street, and wandering just yards from the highway. (His tracker confirms he is now finally snuggled in for hibernation over winter, southwest of the wildlife bridge.)
Calypso may live to reach the ripe age of 80. But his story almost ended differently, and there are still animals getting killed on Oracle Road by moving through openings in nearby neighborhood streets, where either cattle guards couldn’t be installed at the highway entrance or the sound wall ends. We have identified the last remaining areas like this where animals like Calypso are accessing the street – and the highway – near the wildlife underpass in the Vista Mirabella and Vistoso Vistas neighborhoods. Arizona Game and Fish Department’s roadkill surveys confirm a growing hotspot of animals being killed on the highway south of the underpass crossing, where these gaps in the wildlife funnel-fence begin. The Regional Transportation Authority, the Coalition for Sonoran Desert Protection, and your Rancho Vistoso HOA have joined together with neighbors to solve this problem. We’ve been communicating closely with residents living next to these openings to find the best fencing solutions.
Thanks to residents’ help and feedback, the first of these gaps have been closed to wildlife at the end of N. Big Wash Overlook Place. A pedestrian gate was included for trail access to Big Wash. The wildlife fence has been a critical part of the effectiveness of the wildlife crossings, and we look forward to working with residents to close the remaining few gaps so wildlife like Calypso can continue to travel between Big Wash and Catalina State Park without risk of traffic accidents or casualty.
The promise of that remains. Recently, a young desert bighorn ram trotted down a small desert wash east of Oracle Road – the wildlife underpass directly before him, and the Catalina mountains behind him. This rare and memorable wildlife camera photo out of hundreds collected that morning caused us all to cheer! The potential is there for the Big Wash Wildlife Corridor to become a path for Tortolita-bound bighorns.
The importance of this effort lies still in my heart. It comes with the wonder, excitement, and hope that a bighorn and a tortoise bring. For all of us desert dwellers, what better gift is there than that?
For more information:
Visit www.sonoranwildlifecorridors.org for local wildlife monitoring results and wildlife crossing info, or email us at email@example.com. The Coalition will provide brief updates at the Rancho Vistoso HOA Board Meetings.
The new Big Wash Multi-Use Trail has been in Pima County’s planning books for decades. However, with wildlife funnel-fencing guiding animals into the area near the wildlife crossings, and surrounding development constraining open space, Big Wash has gone from an important wildlife movement area to a wilderness-style traffic jam of animals moving and living in this natural corridor. The Coalition successfully worked with Pima County to move the multi-use trail further west, away from the crossing structures. And, by asking people to stay on the trail, we can give people the chance to enjoy the desert without disturbing the larger area and the needs of the critters that rely more than ever on Big Wash. We are also working with Pima County after some erosion-control work in Big Wash resulted in re-vegetation needs near the wildlife underpass. Wildlife are moving around with a bit more frequency before the cold of winter sets in, and we’ve seen quite a few other surprises.