Fantastic Four Wyoming species worth further study

CODY, WYO. — Gray wolves and grizzly bears are typically the endangered or threatened species people most closely associate with the wide open spaces of Wyoming, including the state’s national parks. But Wyoming’s open spaces are teeming with a diverse array of plants and animals that you may never have seen, or even heard of.

Yellowstone and Grand Teton national parks have the largest concentration of mammals in the lower 48 states. Many of these lesser-known animals are just as interesting — and equally important to the larger ecosystem. Some of them are watched as indicators of the overall health of the parks, while others are prized for their reclusive or even ferocious natures.

Bears and wolves — along with other so-called “charismatic megafauna” such as elk, bison and deer — tend to get most of the attention from park visitors and the news media. And perhaps rightfully so. But there are other fantastic, fascinating creatures roaming Wyoming. Surely even a boreal toad deserves at least one day in the spotlight each year.

So as residents across Wyoming plan summer trips into the great outdoors, here are a fantastic four “other” fascinating and compelling animals you might want to know more about. Though none of these fantastic four is technically listed as endangered, they each are closely tracked by researchers for a variety of reasons.

Even if they weren’t sensitive species, wouldn’t you still love the wolverine for its ferocity, the sage grouse for its elaborate courtship displays, the Canada lynx for its air of mystery and the boreal toad for its toxic secretions? OK, maybe three out of four?

Wolverine (Gulo gulo)

The wolverine is a small but ferocious predator that has been known to kill deer or even elk. (Wikimedia — click to enlarge)

Known as ferocious and elusive predators, the shaggy wolverine is the largest member of the weasel family, and is found in alpine and coniferous forests in Yellowstone. Wolverines are active year-round, feeding on rodents, birds, eggs, whitebark pine nuts and other vegetation.

Though they are mainly scavengers during the park’s harsh winters, wolverines (which range from about 15-30 pounds) have been known to sometimes take down prey as large as deer or elk, helping them earn a reputation as the pound-for-pound fiercest predator you’ll never see.

Elusive and typically solitary except when breeding, wolverines are rarely seen by people, including researchers and naturalists. A 2005-09 study found them in the southeast corner of Yellowstone and in the Gallatin National Forest, north of the park.

They are even rarer in the Teton Range, where researchers recently found only two breeding female and two breeding male wolverines.

Greater sage-grouse (Centrocercus urophasianus)

Greater sage grouse
Male sage grouse perform elaborate courtship displayes to attract a mate. (Wikimedia — click to enlarge)

Sage grouse are large, beautifully feathered birds that live among the sagebrush in wide open steppes, so they are typically not found at the higher elevations of Yellowstone. Instead, they are far more common in Grand Teton, as well as in key habitat areas throughout Wyoming. They rely heavily throughout the year on sagebrush for roosting cover and food, including as a source of insects for newly hatched chicks.

Each spring, the birds engage in elaborate rituals aimed at helping them find a mate. Male sage grouse perform intricate displays known as “struts” in an attempt to attract females. The struts take place on leks, or mating grounds, and include subtle vocalizations and other highly specific behaviors. Successful males are able to mate with many females, while less dominate males typically mate with a small number of females, or none at all. So the competition is fierce in what amounts to one of Mother Nature’s intense dance contests.

Grand Teton rangers will often lead excursions in the spring to watch the birds’ courtship struts, and it is not uncommon to close trails, roads or other areas to ensure their mating can proceed undisturbed. Another management concern is the occasional collision between sage grouse and airplanes at the Jackson Hole Airport, the only U.S. airport located inside a national park.

In May 2010, the U.S. Fish and Wildlife Service found that the greater sage grouse warranted protection under the Endangered Species Act. But the agency did not formally list the sage grouse as endangered, citing other species that had more urgent need of protection. The “warranted but precluded” status means the agency will continue to closely monitor the sage grouse, whose habitat across the mountain West has been greatly fragmented by development.

Canada lynx (Lynx canadensis)

The canda lynx is among the most rarely seen predators in Yellowstone Park. (Wikimedia — click to enlarge)

The lynx is considered by many to be among the most secretive carnivores in the greater Yellowstone area. Officially listed as a threatened species, researchers are not exactly sure how many lynx are in Yellowstone, although they have confirmed the animals are living and breeding in the park. Grand Teton scientists have been less successful in their efforts to document lynx there.

An adult lynx typically weighs between 15-35 pounds and measures 2-3 feet in length. Like wolverines, they have large paws that act as natural snowshoes. Lynx grow fur in and around their paw pads, also helping them more easily travel over snow.

Their long ear tufts are perhaps their most distinctive features.

Lynx feed mainly on snowshoe hares in the winter, and their range typically is closely tied to an abundance of that prey animal. During the summer, lynx also eat squirrels, rabbits, rodents and other small mammals.

The Endangered Species Act provides special protections for habitat areas where lynx are likely to be found. A four-year study completed in 2004 found lynx in the central and eastern areas of Yellowstone.

Boreal toad (Bufo boreas boreas)

Boreal toad
Boreal toads secrete a toxic fluid from glands behind their eyes to thwart predators. (Wikimedia — click to enlarge)

The boreal toad is found in both Yellowstone and Grand Teton in relative abundance at various sites, and it is the only native toad in the parks. Despite its relatively widespread numbers, the boreal toad is closely tracked by researchers. It is listed as a sensitive species or a species of concern by various wildlife agencies.

Reports from several decades ago suggest that boreal toads were present in greater numbers then, and the animal has generally been on the decline across much of the West due to habitat loss. But their habitable spaces around Yellowstone and elsewhere tend to fluctuate depending on seasonal precipitation and other hydrological factors. Further study is needed to fully understand how well boreal toads are faring across the greater Yellowstone area.

Like other toads, boreal toads will secrete a defensive toxic fluid from glands behind their eyes, inflaming and irritating the mucous membranes of attacking predators, which can include ravens and other large birds, some carnivorous mammals and some snakes.

Boreal toads hibernate during the winter, typically in dry burrows. They feed on ants, moths and other insects, and sometimes small vertebrates — including smaller, younger boreal toads.

Read more at Yellowstone Gate, and Contact Ruffin Prevost at 307-213-9818 or

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  1. I have no idea how to go about this officially , but the taxonomy of the Lynx needs to change. It isn’t just a ” Canadian” Lynx…it’s a North American lynx, having once ranged from New Mexico to Alaska. The name and Genus species are misleading, and cause for a great deal of the guff over protecting this magnificent cat.

    Lynx northamericanus.

    p.s. the Lynx’ prime food source is/was the Snowshoe Hare, which is as threatened ( obviously ) and also needs to be on the list. Lynx need Snowshoes like Blackfooted ferrets need prairie dogs.