Category: Mammals

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Mountain Lions Are Keystone Providers for Birds!

Mountain Lions Are Keystone Providers for Birds: Mountain Lion, (Felis concolor,) Courtesy US FWS, Larry Moats, Photographer
Mountain Lion
Felis concolor
Courtesy US FWS
Larry Moats, Photographer

Cougar or Mountain Lion(Felis concolor). Courtesy US FWS Cougar or Mountain Lion
Felis concolor
Courtesy US FWS

Yellow-billed Cuckoo, (Coccyzus americannus,) Courtesy and Copyright Eric Peterson, Photographer Yellow-billed Cuckoo
Coccyzus americannus
Courtesy & © Eric Peterson, Photographer

When we think about World Migratory Bird Day, we often think about providing for their needs with water, bird feeders, and native plants, and hopefully we are keeping cats indoors and taking steps to prevent the lethal danger of window-collisions. We may even think about the importance of sponge city landscaping and beaver dams to slow and store snowmelt runoff, but it is the Mountain Lion which has the unique distinction of being a keystone provider ranked as the top vertebrate feeder of birds – in fact they “feed more mammals and birds than any other predator, increasing the number of animal interactions – the links in food webs so essential to maintaining ecosystem resilience. And they are ecosystem engineers on top of this as well.”
(1) Researchers have found that large carcasses create essential habitat for carrion-dependent beetles – these are not just food for beetles, but the very places beetles spend their lives, hiding from predators, seeking mates, raising young, and morphing from larvae [lahr-vee] into adult forms which disperse in search of the next carcass to begin the cycle all over again. (2)The food web gets to the very heart of bird migration, and the very real challenge of ensuring a future in which people and birds can thrive with dwindling habitat resources essential for survival.

Consider the Yellow-billed Cuckoo [koo-koo], one of the World Migratory Bird Day Ambassador species, to highlight the importance of water and riparian habitat for birds. A long-distance migrant, the Yellow-billed Cuckoo breeds in the United States, Mexico, and the Caribbean, and migrates through Central America to reach its wintering grounds in South America. It seeks wooded habitats with water nearby, where it feasts mostly on insects, especially caterpillars, during the spring and summer, transitioning to a more fruit- and seed-heavy diet in the fall and winter.

The Yellow-billed Cuckoo was selected for this year’s World Migratory Bird Day campaign to help shed light on the decline of riparian habitats along our rivers, streams, and freshwater lakes, particularly in the American West, where species that rely on these areas are experiencing population declines and are in possible danger of extirpation from some states. These western riparian species include Summer Tanager, Yellow Warbler, Willow Flycatcher, Yellow-breasted Chat, and Yellow-billed Cuckoo. Loss of native forest to farmland, housing, and other development has led to significant population declines in these species, especially in the case of the Cuckoo, which relies on large patches of streamside forest for breeding.

The Yellow-billed Cuckoo is becoming an increasingly rare bird in the American West. We need to increase awareness and encourage decision makers to explore ways to protect riparian areas, remove invasive species, restore habitat, and conserve water. World Migratory Bird Day 2023 aims to contribute to these efforts by highlighting the importance of water conservation and habitat management for migratory birds, and by providing resources to help promote these important issues. Bird Day is every day, but especially mid-May and mid-October. Learn more at migratorybirdday.org, and learn more about how to conserve water for sustaining bird life!

I’m Hilary Shughart with the Bridgerland Audubon Society, and I am Wild About Utah!

Credits:
Images: Mountain Lion images Courtesy US Fish & Wildlife Service, Larry Moats, Photographer
     Yellow-beaked Cuckoo, Courtesy & Copyright, Eric Peterson, VikingPhotographyUtah
Featured Audio: Courtesy & Copyright © Kevin Colver, https://wildstore.wildsanctuary.com/collections/special-collections/kevin-colver
Text: Hilary Shughart, President, Bridgerland Audubon Society
Additional Reading: Hilary Shughart and Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

WildAboutUtah pieces by Hilary Shughart, https://wildaboututah.org/author/hilary-shughart/

“In research recently published in the prestigious journal, Oecologia, we show that mountain lions are ecosystem engineers that create essential habitat for carrion-dependent beetles. It is the first research to show that an apex predator plays the role of engineer. In collaboration with graduate researcher, Josh Barry, and Dr. Melissa Grigione at Pace University, we collected and identified 24, 209 beetles across 18 sites, representing 215 unique beetle species. The carcasses abandoned by mountain lions were not just food for beetles, but the very places beetles spent their lives, hiding from predators, seeking mates, raising young, and morphing from larvae into adult forms that dispersed in search of the next carcass to begin the cycle all over again.”
Barry, J.M., Elbroch, L.M., Aiello-Lammens, M.E. et al. Pumas as ecosystem engineers: ungulate carcasses support beetle assemblages in the Greater Yellowstone Ecosystem. Oecologia 189, 577–586 (2019). https://doi.org/10.1007/s00442-018-4315-z

Mountain Lions as Ecosystem Engineers, MarkElbroch.com, , [Accessed April 29, 2023]

Mountain Lion Conservation, MarkElbroch.com, , [Accessed April 29, 2023]

EOC 206: Mark’s Cougar Conundrum, Eyes on Conservation Podcast, https://podcasts.apple.com/us/podcast/the-eyes-on-conservation-podcast/id916341600 [Accessed April 30, 2023]

Elbroch, Mark, The Cougar Conundrum, Sharing the World with a Successful Predator,, Island Press, August 2020, https://islandpress.org/books/cougar-conundrum [Accessed April 30, 2023]

Panthera USA, https://www.panthera.org/ [Accessed April 30, 2023]
Mark Elbroch, Ph.D., Panthera USA, https://panthera.org/mark-elbroch-phd [Accessed April 30, 2023]

MarkElbroch.com, [Accessed April 29, 2023]

Wiggins, D. (2005, March 25). Yellow-billed Cuckoo (Coccyzus americanus): a technical conservation assessment.
[Online]. USDA Forest Service, Rocky Mountain Region. Available: https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5182002.pdf [Apr 30, 2023].

Yellow-billed Cuckoo Coccyzus americanus, All About Birds, Cornell Lab of Ornithology, Cornell University, https://www.allaboutbirds.org/guide/Yellow-billed_Cuckoo/

May 13 & October 14, World Migratory Bird Day 2023, WATER, UNEP/CMS Secretariat and UNEP/AEWA Secretariat, https://www.worldmigratorybirdday.org/

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Sled Dogs-Sheer Joy

Sled Dogs-Sheer Joy: Sun, Snow, Sheer Joy, Courtesy & © Mary Heers, Photographer
Sun, Snow, Sheer Joy
Courtesy & © Mary Heers, Photographer
As the snow continued to pile up this winter, I started to ask around about sled dogs.

I soon bumped into a friend who had a friend in Preston who trained and occasionally raced his team of 14 Alaskan Huskies.

This musher graciously offered to give me a ride on one of his training runs. I showed up all smiles as he was harnessing his team. The dogs were excited to go and actually howling with happiness. The musher asked if I wanted to get in – or ride up the trail a bit on a snowmobile with his teenage son to a more level spot. In a rare moment of sanity, I opted for the snowmobile.

The machine had just pulled out of the yard when I heard his son say, “Oh, No!”

I looked back in time to see the sled tip over, sending the musher sliding across the driveway and under my car parked at the end of it. I jumped off the snowmobile as the dogs shot past us with the empty sled. The dogs were gaining on a truck up ahead, then shot past it with the snowmobile in hot pursuit.

I was left standing in a snowbank wondering if I’d wandered into a James Bond movie.

My first encounter with sled dogs had gone a lot smoother. I was visiting Denali National Park in Alaska and the rangers were introducing us to one of the dog teams that they still use to patrol the park.

But the most famous sled dogs are the freight teams that carried anti-toxin from Anchorage to Nome during an outbreak of Diphtheria in 1925. The dog teams ran a thousand miles and are credited with saving hundreds of lives.

For the last 50 years, modern mushers have retraced this journey in the ultimate sled dog race, the Ididarod. The best account I’ve read about the world of training sled dogs and running the Ididarod is Gary Paulsen’s book Winterdance. Just before going on a training ride, he discovered, “the gangline was trembling, quivering like a string on a guitar. It fairly hummed and I felt there was great power there. The trees in the yard went by in a mad blur and we left the yard at warp speed.”

Paulsen also lets us in on the deep relationship mushers form with their dogs: “As they understand you will give them meat when they run, and love when they run, and your soul when they run – as they learn to feel that, understand that, know that – they are no longer sled dogs – they become distance dogs, dogs that cannot, will not be stopped.” Paulson ran the Iditarod in 1983. It was a wild ride that took 17 days. But he finished.

Meanwhile, back in Preston, our teenage hero had caught up with the runaway team, made a flying leap from the snowmobile onto the empty sled, and somehow managed to stop the team. Pretty soon the musher and I caught up.

“Do you still want to get in?” he asked.

“Sure,” I said.

And we were off. The dogs settled into a steady trot. From then on it was all Sun and Snow and the sheer Joy of sliding quietly through the magnificent winter scenery.

This is Mary Heers and I’m Wild About Utah

Credits:
Photos: Courtesy & Copyright Mary Heers, Photographer
Featured Audio: Courtesy & Copyright Mary Heers
Text: Mary Heers, https://cca.usu.edu/files/awards/art-and-mary-heers-citation.pdf
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah, Mary Heers’ Postings

Paulsen, Gary, Winterdance: The Fine Madness of Running the Iditarod, Harvest Books, HarperCollins February 17, 1995, https://www.amazon.com/Winterdance-Fine-Madness-Running-Iditarod/dp/0156001454/

Idaho Sled Dog Challenge, https://idahosleddogchallenge.com/

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Wildlife Escape and Passage

Right of Way Escape Ramp Near Santaquin, UT Courtesy & Copyright Lyle Bingham, Photographer
Right of Way Escape Ramp
Near Santaquin, UT
Courtesy & Copyright Lyle Bingham, Photographer

Safety Side, Corner Escape Ramp Near Santaquin WMA Courtesy & Copyright Lyle Bingham, Photographer Safety Side, Corner Escape Ramp
Near Santaquin WMA
Courtesy & Copyright Lyle Bingham, Photographer

One-way, Metal Gate Near Santaquin WMA Courtesy & Copyright Lyle Bingham, Photographer One-way, Metal Gate
Near Santaquin WMA
Courtesy & Copyright Lyle Bingham, Photographer

Climbing Side, Corner Escape Ramp Near Santaquin WMA Courtesy & Copyright Lyle Bingham, Photographer Climbing Side, Corner Escape Ramp
Near Santaquin WMA
Courtesy & Copyright Lyle Bingham, Photographer

Underpass and Jump Ramp Near Santaquin WMA Courtesy & Copyright Lyle Bingham, Photographer Underpass and Jump Ramp
Near Santaquin WMA
Courtesy & Copyright Lyle Bingham, Photographer

Rural Road Leading to Santaquin Wildlife Management Area Courtesy & Copyright Lyle Bingham, Photographer Rural Road Leading to Santaquin
Wildlife Management Area
Courtesy & Copyright Lyle Bingham, Photographer

Deer and other wildlife have been migrating across our state much longer than humans. When people drove horse-drawn wagons and slower vehicles, wildlife could easily pass without a problem. However, with the introduction of fenced highways and their increased speed and traffic, problems quickly arose. In this case, the problem is mostly with mule deer, because they comprise 90% of the animals migrating in Utah. Robert Frost wrote that “Good fences make good neighbors.” But neighbors need to cooperate to maintain a fence, and even with fences in place, what if the neighbors are animals? The problem is how to keep migrating deer from jumping fences and causing accidents.

Animal/vehicle encounters cause over 5,000 animal deaths in Utah each year. Beyond the loss of life, it is also an economic problem, not only for wildlife management but also for vehicle owners. Some estimate the deer are worth more than $2,500 each. Joshua Coursey wrote in the Deseret News, that the “estimated cost of collisions with mule deer in Utah reached close to $50 million in 2021.” That’s why the Utah Department of Transportation (UDOT) and the Division of Wildlife Resources (DWR) have worked for decades to reduce wildlife/vehicle encounters. As noted, fencing alone does not work; consequently, highway managers have had to find ways to get trapped deer across and away from fenced roads.

When USU researchers studied escape mechanisms in Sardine canyon, they found earthen escape mounds were superior to one-way, metal gates. Climbing a hill is more natural to deer than pushing through a metal gate. These mounds enable a one-way jump to safety. However, escape alone does not solve the driving force of migration.

A more effective way to handle migrating animals is to guide them above or below the road. UDOT explains: “Studies have shown there is a 90% reduction in wildlife/vehicle collisions when there is a crossing structure and fence in the area.” Since 1975, when UDOT built its first wildlife overpass near Beaver, Utah, deer, moose and elk, along with bear and mountain lions have begun to use wildlife underpasses and overpasses. More recently, a larger overpass was built in Parley’s Canyon on I-80. Videos show a variety of animals who successfully traverse that overpass.

But escape ramps and overpasses aren’t the only tools available. Passage is also possible using creek beds or culverts crossing under roads. Tall fences are effective in guiding animals toward structures and preventing roadway access. Then, to encourage faster adoption, contractors have found they can walk a herd of cattle through the structure, overpowering human scents

When on I-15, I-80, I-70, or in our canyons, watch for overpasses, underpasses, one-way gates and exit ramps. They demonstrate a few ways the DWR and UDOT are working together to preserve human and animal lives.

This is Lyle Bingham, and I’m Wild About Utah and our 15 years on Utah Public Radio.

Credits:
Videos: Utah Division of Wildlife Resources https://wildlife.utah.gov
Photos: Courtesy & Copyright Lyle Bingham, Photographer
Featured Audio: Courtesy & Copyright © Friend Weller, Utah Public Radio upr.org
Text: Lyle Bingham, https://bridgerlandaudubon.org/
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah, Lyle Bingham’ Wild About Utah Postings

USU-Connected Researchers Mitigating Wildlife Migration Issues:
John Bissonette, Patricia Cramer and Mary Hammer

Bissonette, J. A. and M. Hammer. 2000. Effectiveness or earthen return ramps in reducing big game highway mortality in Utah. UTCFWRU Report Series 2000 (1): 1-29.https://escholarship.org/content/qt2f1080nm/qt2f1080nm.pdf

Buford, Daniel, Cramer, Patricia, and Simpson, Nova, Integrating Wildlife Connectivity and Safety Concerns into Transportation Planning Processes, Federal Highway Administration, US Department of Transportation, Winter 2023, https://highways.dot.gov/public-roads/winter-2023/04

Wildlife Connectivity Institute, https://www.wildlifeconnectivity.org/

“A dynamic part of a National Cooperative Highway Research Program sponsored research project titled; ‘Evaluation of the Use and Effectiveness of Wildlife Crossings.'”, https://www.wildlifeandroads.org/

Muffoletto, Mary-Ann, USU Ecologist [Patricia Cramer] Honored for Wildlife Highway Crossing Research, Utah State Today, Utah State University, April 16, 2015, https://www.usu.edu/today/story/usu-ecologist-honored-for-wildlife-highway-crossing-research

Muffoletto, Mary-Ann, USU Ecologist Leading Efforts to Stop Wildlife-Vehicle Collisions, Utah State Today, Utah State University, September 2, 2010, https://www.usu.edu/today/story/usu-ecologist-leading-efforts-to-stop-wildlife-vehicle-collisions


DWR: “It’s the video seen around the world! This compilation of footage shows various animals using the wildlife crossing constructed in 2018 over Interstate 80 near Parleys Summit. What’s especially notable with this crossing is how many animals are already using it; usually it takes several years for wildlife crossings to become widely used.

This video went viral near the end of 2020, and was celebrated as great progress in the problem of wildlife-vehicle collisions. Special thanks to the Utah Division of Wildlife Resources, Utah Department of Transportation and Summit County for the footage.” https://wildlifemigration.utah.gov/stories/parleys-summit-wildlife-crossing/


UDOT: Baker Canyon Wildlife Crossing Installation


DWR: “Utah’s highways are vital to the health of the state. They can present a significant barrier for wildlife migration. In order to prevent automobile/wildlife collisions and to increase habitat availability for animals, Wildlife biologists and the Utah Department of Transportation have designed and installed several overpasses and underpasses to allow wild animals to safely cross the highway.”

Green, Ashley, Highway wildlife crossings, Connections between habitats are important for wildlife. Wildlife Blog, Utah Division of Wildlife Resources, Utah Department of Natural Resources, https://wildlife.utah.gov/news/wildlife-blog/675-highway-wildlife-crossings.html

Kenley Fry, Rachel, Safe passage: Sardine Canyon wildlife crossings improved, The Herald Journal, October 21, 2012 Updated May 4, 2015 https://www.hjnews.com/allaccess/safe-passage-sardine-canyon-wildlife-crossings-improved/article_2d38f7f4-1b1d-11e2-a588-0019bb2963f4.html

Mapping Migration Corridors, Wildlife Migration, Utah Wildlife Migration Initiative, Division of Wildlife Resources, Department of Natural Resources, State of Utah, https://wildlifemigration.utah.gov/land-animals/corridors/

DWR, UDOT and other partners complete 11 projects, 1 study to help wildlife and fish safely migrate across Utah in 2025, Utah Division of Wildlife Resources, Utah Department of Natural Resources, January 20, 2026, https://wildlife.utah.gov/news/utah-wildlife-news/2246-dwr-and-udot-and-partners-complete-eleven-projects-and-a-study-to-help-wildlife-and-fish-safely-migrate-in-2025.html

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Celebrating Rodent Engineers

Welcoming Rodent Engineers: Spawn Creek Beaver Dam and Pond Courtesy and Copyright Bethany Neilson, Photographer
Spawn Creek Beaver Dam and Pond
Courtesy and Copyright Bethany Neilson, Photographer

North American beaver (Castor canadensis) Courtesy US FWS, Larry Palmer, Photographer North American beaver
(Castor canadensis)
Courtesy US FWS, Larry Palmer, Photographer

Spawn Creek Beaver Dams Courtesy & Copyright Joe Wheaton Spawn Creek Beaver Dams
Courtesy & Copyright Joe Wheaton, Photographer

Installing Beaver Dam Analogues, Rio Cabolla, Santa Fe National Forest, Courtesy USDA Forest Service Installing Beaver Dam Analogues
Post Fire Rehabilitation
Rio Cabolla, Santa Fe National Forest,
Courtesy USDA Forest Service

Completed Beaver Dam Analogues, Rio Cabolla, Santa Fe National Forest, Courtesy USDA Forest Service Completed Beaver Dam Analogues, Rio Cabolla, Santa Fe National Forest,
Courtesy USDA Forest Service

Finding a beaver dam gives me a sense of discovery and connects me to the past. I fondly remember my parents pointing out dams when we drove up Logan canyon. Instinctively, we’d scan, hoping to see the animals that built and maintained those structures. When we talked about beaver dams, the conversation often turned to trappers who would rendezvous and re-supply in the Bear Lake and Cache valleys. We lived where history had happened, and I was eager to know more.

Years later, inspired by a history class, I read Dale Morgan’s Jedediah Smith and the Opening of the West. Morgan followed the travels of Smith and his fellow trappers who answered William Ashley’s 1822 ad in the Missouri Gazette requesting “ONE HUNDRED MEN, to ascend the river Missouri to its source, there to be employed for one, two, or three years….”

Ashley’s troop competed with the Hudson’s Bay Company, the American Fur Company and several native indigenous tribes, all trapping beaver. The story sounds familiar: beaver pelts, and later bird feathers, were used to create hats, and the movement to harvest them led to a significant decline in numbers. For the birds, this decline led to building refuges and other conservation efforts. But the plight of the beaver continued downhill as exploration and discovery encouraged an influx of settlers. For the next century, the remaining beaver were regarded by those settlers as invasive land-grabbers, in competition with efforts to direct water, mine and irrigate.

However, today beavers are gaining more respect as we better understand the benefits of their skills in supporting wildlife and wetland conservation. Researchers at Utah State University, including Joe Wheaton and Nick Bouwes of the Department of Watershed Sciences, are studying habitat improvement after beaver introduction as a cost-effective way to combat drought and fire.

They have repeatedly demonstrated, over the past few years, that beaver families can be introduced and thrive behind fabricated beaver dam analogues(BDAs). After release into the resulting ponds, the beavers take over maintenance and produce their own dams. Over time, these dams and their rodent engineers improve stream flows, raise water tables, and cool water temperatures.

In essence, active beaver dams create Mesic habitats where the land maintains a well-balanced supply of moisture throughout the growing season. These dams slow spring run-off as they retain water in ponds and the surrounding soil, thereby, securing water for fish, trees, birds and wildlife. The best part is that the beavers do the maintenance.

When wildfires occur, beaver oases preserve wildlife and habitat. However, if beaver and their habitats don’t exist in an area before a fire, they can still play a role. By retaining water with beaver dam analogs, we can create wetlands conducive to beaver habitat. In Joe Wheaton’s words, “We can’t dump beaver into a watershed that has burnt to the ground and expect them to do the restoration of degraded streams on their own…. What we can do post-fire is accelerate recovery with low-tech structures that make it easier to more quickly get beaver into an area and accelerate recovery. We’d like to help them do that.” (Utah State Magazine, Winter 2019, p.12)

To learn more about how birds, beaver and water are key to the understanding and improvement of our environment, and to find ways to get involved, check out this story on this wildaboututah.org.

I’m Lyle Bingham for Bridgerland Audubon, and I’m Wild About Utah

Credits:
Photos: Beaver Dam, Courtesy & Copyright © Bethany Neilson, Photographer https://uwrl.usu.edu/people/faculty/neilson-bethany
Spawn Creek Beaver Dams Courtesy & Copyright Joe Wheaton
Installing & Completed Beaver Dam Analogues, Rio Cabolla, Santa Fe National Forest, Courtesy USDA Forest Service
Featured Audio: Courtesy & Copyright © Friend Weller, Utah Public Radio upr.org
Text: Lyle Bingham, https://bridgerlandaudubon.org/
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah, Lyle Bingham’ Wild About Utah Postings

Strand, Holly, Beavers: The Original Army Corps of Engineers, April 29, 2010, https://wildaboututah.org/beavers-the-original-army-corps-of-engineers/

Leavitt, Shauna, Beaver–Helping Keep Water on Drying Lands, April 17, 2017, https://wildaboututah.org/the-beaver-helping-keep-water-on-drying-lands/

Leavitt, Shauna, Sixty In-stream Habitat Structures in Four Days: Demonstrating Creek Restoration Techniques, December 18, 2017, https://wildaboututah.org/sixty-instream-habitat-structures-in-four-days-demonstrating-creek-restoration-techniques/

Hellstern, Ron, Leave it to Beaver, July 30, 2018, https://wildaboututah.org/leave-it-to-beaver/

Leavitt, Shauna, Proposed Beaver Holding Facility in Millville, Utah, September 3, 2018, https://wildaboututah.org/proposed-beaver-holding-facility-in-millville-utah/

Leavitt, Shauna, Beaver in Utah’s Desert Rivers, July 6, 2020, https://wildaboututah.org/beaver-in-utahs-desert-rivers/

Heers, Mary, Beaver Tail Slap, October 12, 2020, https://wildaboututah.org/beaver-tail-slap/
(re-aired in late December 2021)

Other Favorites:

Randall, Brianna, Nature’s Engineers: How Beavers Boost Streamflows and Restore Habitat, https://www.sagegrouseinitiative.com/natures-engineers-how-beavers-boost-streamflows-and-restore-habitat/
Randall, Brianna, How Beavers Boost Stream Flows, National Wildlife Federation, January 8, 2020, https://blog.nwf.org/2020/01/how-beavers-boost-stream-flows/

Low-Tech Process Based Restoration of Riverscapes Design Manual, https://lowtechpbr.restoration.usu.edu/manual/

New Manual for Low-Tech Riparian Restoration, https://www.sagegrouseinitiative.com/new-manual-for-low-tech-riparian-restoration/

Randall, Brianna, Beavers, Water, and Fire—A New Formula for Success, Low-tech stream restoration works wonders for people and wildlife, National Wildlife Federation, October 30, 2018, https://blog.nwf.org/2018/10/beavers-water-and-fire-a-new-formula-for-success/

Nicholas Weber ,Nicolaas Bouwes,Michael M. Pollock,Carol Volk,Joseph M. Wheaton,Gus Wathen,Jacob Wirtz,Chris E. Jordan, Alteration of stream temperature by natural and artificial beaver dams, May 17, 2017, https://doi.org/10.1371/journal.pone.0176313 OR https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0176313

Prettyman, Brett, Dolling (SLTRIB), Justin(UT DWR), Beavers in Utah, Creators of Habitat, The Salt Lake Tribune & Utah DWR, Oct 15, 2009 •

Utah’s population of beaver has recovered since the days when they were trapped by mountain men, but some people wonder if moving beaver to traditional habitats may help deal with drought.

Utah Beaver Management Plan, Utah Division of Wildlife Resources, https://wildlife.utah.gov/pdf/furbearer/beaver_plan_2010-2020.pdf

Birds, Beaver and Water in a Changing Climate, Bridgerland Audubon, https://bridgerlandaudubon.org/birds-beaver-and-water-in-a-changing-climate/

Goldfarb, Ben, Eager: The Surprising, Secret Life of Beavers and Why They Matter, Chelsea Green Publishing, March 8, 2019, https://www.amazon.com/Eager-Surprising-Secret-Beavers-Matter/dp/1603589082/ref=asc_df_1603589082/