Research seeks reasons for demise of mule deer

Across Wyoming, herds are down by a third


This story was originally published at First of two parts. Part Two is here. Wyofile also has a video about the deer capture, "When Mule Deer Fly."


Pilot Mark Shelton swoops the Robinson R44 helicopter to hover near an oil well, gently setting down bagged, blindfolded and trussed-up mule deer No. 42 that’s dangling below the airship.

Eight researchers rush to gather the doe and another female that Shelton and his net-gunner have just caught. The ground team will measure, weigh and take samples from the two does for one of five western-Wyoming mule deer studies.

“She’s a pretty small gal,” Carhartt and wool-clad graduate researcher Samantha Dwinnell says after reviewing 42’s measurements. Five feet, five inches from nose to tail, 120 pounds.

Capturing mule deer.
Aly Courtemanch and Matt Kauffman give a doe a sendoff after unstrapping its legs and removing its blindfold. In a week-long field exercise, University of Wyoming researchers catch 175 deer for five separate studies. (Angus M. Thuermer Jr./Wyofile)

There’s a lot more Dwinnell and her colleagues know about this mother because they’ve caught her before. She had a fawn this year, twins the year before.

At six-and-a-half years old, her body fat amounts to 9 percent of her weight. She summered on the upper Smith’s Fork, migrated 43 miles, swam the Green River to get here.

She has a 39-inch chest, a 14-inch metatarsus – the lower part of her back leg. She’s fat and sassy, struggling occasionally against her bonds.

Along with other does that roam the forested mountains and sage hills from Star Valley to Kemmerer, she’s the hope of a troubled 33,000-member herd. Gathering their stories, Dwinnell and others at the University of Wyoming Cooperative Fish and Wildlife Research Unit hope to inform decision-makers how they might restore a herd that once numbered 50,000.

“Mule deer are struggling,” says Matt Kauffman, University of Wyoming professor of zoology and physiology, who with his crew, caught, wrangled and released 175 deer one week last December. “Mule deer are declining across Wyoming and the West.”

Wyoming Game and Fish Department strives for a population of 564,150 mule deer, but the last statewide estimate was 374,400, just two-thirds of objective. Biologists considered the Wyoming Range a mule deer factory, but today its herd mimics the statewide decline.

“It was an incredibly important destination for sportsmen,” Kauffman says of the Wyoming Range and the Salt River Range that rises beside it in Sublette and Lincoln counties. “Game and Fish was pushing to do a study … they’re explicitly trying to understand why Wyoming Range numbers haven’t recovered.”

To that end, the co-op team takes to the field twice a year to catch Doe 42 and about 40 other radio-collared female herd members. The Wyoming Range study is one of five the team will work on for a week. In eight days they’ll capture does from the Pinedale Mesa to the Red Desert, from Cokeville to Rock Springs.

“The major theme is mule deer and their habitats in transition,” Kauffman says. The studies focus on the impact oil and gas and other development has on wintering mule deer, how it affects their migration, and the effect of long-term drought or climate change.

Researchers also monitor what’s believed to be the second longest terrestrial migration in the Western Hemisphere. Four thousand to 5,000 mule deer travel 150 miles from the Red Desert to Hoback Junction twice a year.

“We’re really trying to tell their story, their individual stories,” says Kevin Monteith, an assistant research professor at the university. “They are the ones that are providing information.”

Hauling captive deer.
Matt Hayes, Melia Devivo and Teal Wyckoff haul a deer from the landing site for processing. After a helicopter team drops the does off, researchers spend about 10 minutes collecting data from each animal. (Angus M. Thuermer Jr/WyoFile)

The eight days of capturing are hectic. “Dr. Monteith’s 5 AM alarm ringtone is stuck in my head,” Kauffman tweets one morning. He’s broadcasting the capture week on Twitter and Facebook.

Most of the core team of about 10 stays at a U.S. Forest Service bunkhouse in Pinedale during the first half of the week. It’s got eight bedrooms, common space, and a kitchen.

“The students” cook a spaghetti dinner one evening. When the team’s home at night, a dozen pairs of winter boots dry by the door. As bedtime approaches, Kauffman, Monteith and others work on their computers, Dwinnell collects radio collars, drugs and other supplies.

Before light the next morning, workers begin their routine, dressing warmly, swilling coffee and bolting bagels. Game and Fish wardens and other helpers join the university students and teachers at a parking-lot rendezvous.

Before the first coffee klatch assembles in Pinedale, their convoy is on the road. It takes about an hour to reach the day’s first staging location near LaBarge. On a ridge top, the team sets up a scale and mats as the sound of a helicopter grows with the dawn.

All the studies rely on catching, collaring, measuring and following mule deer. The helicopter crew catches the animals from the air with a net gun, then drops a “mugger” off to wrangle the animal into a set of hobbles and blindfold. Once trussed, the deer is laced into a bag and slung below the airship to be deposited gently near the staging and processing site.

Three of the studies catch the same set of deer twice a year; the helicopter team must seek specific animals to net. The ground team takes measurements, performs tests and gathers samples before releasing a deer to its herd and family.

Working on captive deer.
Devivo and Kauffman work on a deer as other team members perform their tasks. Researchers draw blood, replace radio collars as necessary, obtain a fecal sample and other data before releasing each animal. (Angus M. Thuermer Jr/WyoFile)

It takes about 10 minutes to process a deer once Shelton and mugger Donnie Wackerman deliver it. A team of four workers runs to where Shelton sets down the animal, then carries it to a processing pad.

Dwinell checks the teeth. She’ll pull one from each new deer to get an accurate age.

Love of the outdoors attracted her to this work. A University of Wyoming masters’ candidate, she graduated from the University of Minnesota in Duluth in 2007 and planted herself in the Rockies, learning mountain ethos in Victor, Idaho. Now on her fourth capture week, she’s a key organizer of the field team.

“Double check the ID,” she reminds the crew late on a cold, tiring day. “Make sure you have the capture number. None of it means anything unless it’s on the data sheet.”

Most team members are her fellow lab mates who have field experience and hustle. “We like working in those environments,” she says of the snow and cold. “Adverse weather doesn’t bother most of us. It’s sort of what we thrive on.”

When she’s checking a deer’s teeth, another team member inserts a thermometer at the animal’s far end. There’s a danger it might overheat from the stress of being captures.

“One-o-four is the threshold,” first-year masters student Alex May says of the highest tolerable temperature. “One-oh-three is when we pay attention.”

Too much heat calls for a cold-water enema.

Meantime, one team member will draw a large syringe of blood to be distributed into vials and onto blotter pads. Someone checks the radio collar and replaces it as necessary.

Another worker stretches a tape along and around the deer, then measures a back leg joint. A gloved volunteer mines for a fecal sample, sealing it in a plastic bag. In the lab, someone will find out what each doe ate.

At the rump, assistant research professor Kevin Monteith scrapes hair off a small patch of skin. He applies an ultrasound sensor to help calculate the percent of body fat. He checks for milk – it will tell whether she successfully brought a fawn or fawns to the winter range.

Brett Jesmer, a doctoral candidate in the zoology and physiology department drills deeper. When Monteith is done at his bare patch on the rump, Jesmer moves in with a numbing agent and biopsy needle.

He extracts a sample of fat and muscle for analysis. They will reveal how well she benefited from her summer’s grazing. After her condition changes over the winter and she’s caught again, he’ll know what she’s burning — fat or muscle — to survive the winter.

He swabs the biopsy site as the doe gets a shot of antibiotics before being weighed. A scribe jots down all the information.

Co-op unit leader Kauffman, son of an Oregon horse logger and schoolteacher, grew up in the outdoors. Now, wandering mulies keep him bonded to those places.

“As a kid and a youngster, I’ve always enjoyed hiking and camping and mountains and wide-open spaces,” he says. “In migrations, the animals are connecting those things for you.

“I don’t typically connect to the animals on a more intimate level,” Kauffman says. Yet he knows the charisma the fuzzy species holds.

“When my 12-year-old son came out as a volunteer, he was holding the head of the animal and petting it for me.”

Monteith is different. During the week he routinely cradles a captive deer’s blindfolded head in his lap, petting it gently. One brays and kicks as he inadvertently pains it during the processing.

“Sorry sweetheart,” he says. “It’s my fault.”

The researcher’s reactions are natural, Dwinnell says. “The animal is undergoing a lot of stress. It’s sort of instinctual to give it the kind of comfort we’re used to — talking to the animal, petting the animal.”

Game and Fish warden Todd Graham, who joined the capture team for a few days, more often deals with animals that are dead or in distress. They’ve been hit by trucks, just killed by hunters. Helping researchers gives him a different experience.

“It’s not often you get to put your hands on live, healthy animals,” he says cradling a captured mule deer’s head and rubbing its neck as colleagues work on it.

Masters candidate Teal Wyckoff talks to deer too. “Although we say things, it’s for ourselves,” Wyckoff says. “In reality we are perceived as the threat.”

Among the observations recorded on each animal’s capture data sheet is a characterization of its anxiety.

“The vast majority are in that ‘calm’ category,” Wyckoff says. It’s possible that after being captured once or twice, the deer are less frightened.

“I think they actually get used to us,” she says, “but that’s not a rule."

If researchers don’t fall for the does’ cuddly looks, they marvel after learning what it takes to raise a family in the Wyoming mountains. Monteith marvels at one old doe whose teeth are just about worn down.

She’s lactating. She’s raised another generation of mulies since he saw her last, even though she can barely chew.

“She won’t quit,” he says. “They’ll continue to produce babies and raise them as long as they’re alive. The more I learn about their world, the more respect I have for them.”

Dwinnell’s awe grows as she tracks and watches mule deer that she knows. In summer she’ll follow them across a tapestry of forests, cliffs and rivers.

“Most of them summer in real high elevations – some of them in extreme terrain,” she says.  “Some can travel a hundred-plus miles to these winter ranges where they’re exposed to these harsh environments. That’s enough to warrant a lot of respect.”

Fawn surveys are the most fun, especially those she conducts in idyllic wilderness meadows, rich with all things natural.

“It’s pretty satisfying to see them come back when they’ve raised two fawns,” she says. “It makes sense — [they] were in really awesome habitat. Scientific theories pan out the way you would expect them to.”

Releasing a deer.
Game and Fish wardens Gary Fralick and Todd Graham, with UW research professor Kevin Monteith, release a mule deer near Big Piney. Handlers follow a routine that helps keep them from getting kicked, but it doesn’t always work.(Angus M. Thuermer Jr./WyoFile)

The deer's long-range movements are endlessly fascinating for Kauffman and they make up an important aspect of all five studies.

“Why do they make these migrations, how do they benefit from them,” he asks. “One of the most interesting things about terrestrial migrations and things like mule deer is all the decisions they make. And you have these vast landscapes that support these movements. It forces you to think about the animals and the landscape at the same time.

“The most difficult question is how they respond when the landscape is altered,” he says. “They’re encountering more fences, running into people, roads.

“The biggest question is, in what state of wildness do these landscapes need to remain in in order for these migrations to still be incredibly beneficial strategies for these animals?”

High Country News Classifieds
    Dreaming of a trip to Yellowstone Park? This book makes you the tour guide for your group! Janet Chapple shares plenty of history anecdotes and...
    Non-Profit Management Professional specializing in Transitional Leadership, Strategic Collaborations, Communications and Grant Management/Writing.
    The Powder Basin Watershed Council, headquartered in Baker City, Oregon, seeks a full-time Sage Grouse CCAA Coordinator. This position is part of a collaborative effort...
    High Country News, an award-winning media organization covering the communities and environment of the Western United States, seeks a Marketing Communications Manager to join our...
    Executive Director, Okanogan Land Trust Position Announcement Do you enjoy rural living, wild places, family farms, challenging politics, and big conservation opportunities? Do you have...
    Close to town but with a secluded feel, this eco-friendly home includes solar panels, a graywater reuse system, tankless hot water, solar tubes, and rainwater...
    Powder River Basin Resource Council, a progressive non-profit conservation organization based in Sheridan, Wyoming, seeks an Executive Director, preferably with grassroots organizing experience, excellent communication...
    Organize with Northern Plains Resource Council to protect Montana's water quality, family farms and ranches, & unique quality of life. Starts $35.5k. Apply now-
    - beautiful 12" yule log made from holly wood, live fragrant firs, rich green and white holly, pinecones and red berries. $78 includes shipping. Our...
    Crazy Horse Memorial, in the Black Hills of South Dakota, is currently accepting applications and nominations for the Director of Programs for The Indian University...
    Crazy Horse Memorial is currently accepting applications for the Manager of Residence Life for The Indian University of North America. This position is responsible for...
    Are you an art lover who dreams of living in the mountains? Is fundraising second nature to you? Do you have experience managing creative people?...
    The Public Lands Foundation, a non-profit organization supporting the multiple-use management of public lands managed by the Bureau of Land Management, seeks an experienced leader...
    Unique handmade gifts from the Gunnison Valley. Soy lotion candles, jewelry, art, custom photo mandalas and more. Check out the website and buy Christmas locally...
    North Cascades Institute seeks their next Executive Director to lead the organization, manage $4 million operating budget, and oversee 60 staff. Send resume/cover letter to...
    High Country News, an award-winning media organization covering the communities and environment of the Western United States, seeks an Editor-In-Chief to join our senior team...
    2 houses on 37+ acres. Gated subdivision, Penrose Colorado. $400k. Possible lender financing. Bob Kunkler Brokers Welcome.
    Built in 1901, The Crazy Mountain Inn has 11 guest rooms in a town-center building on 7 city lots (.58 acres). The inn and restaurant...
    Seeking an experienced, hardworking partner to help restore a desert watershed/wetland while also creating a pollinator oasis at the mouth of an upland canyon. Compensation:...
    by Don Hagedorn. A story of how lives of the visually impaired are improved through the love and courage of guide dogs. Available on Amazon.