Magical Mustelids

Environment, Jackson Hole, Wildlife

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Grand Teton National Park is home to many types of small mammals, including the Magical Mustelids. This family of fearless carnivores includes badgers, fishers, martens, mink, river otters, wolverines, and three weasels: the least weasel, the long-tailed weasel, and the short-tailed weasel or ermine.

A nice brown coat for summer.

The short-tailed weasel measures between 7 and 13 inches including the tail, and despite their diminutive size, they really believe themselves to be quite tough. I remember one little guy I saw while hiking with some clients along the river – he bravely held the trail against four much-larger mammals, and would not let us pass. It turns out the weasel symbolizes courage in many Native American cultures. Even though they are small and only weigh up to 12 ounces they will readily attack larger animals. They are effective hunters, preying mostly on mice and voles. (Researchers rely on the presence of weasels as an indicator of an abundant rodent population.) They are also terrific climbers, so our avian friends are not immune to their predatory survival strategies.

How does the little short-tailed weasel survive the long cold winters in Jackson Hole? Food, shelter, and companionship are critical. With their long bodies, low weight, and lack of body fat, weasels have some distinct disadvantages during the long winter months. They must keep warm by eating up to 40 percent of their weight every day, and may occasionally engage in “killing sprees” so that they can storing leftovers as a hedge against days without any kills. They use up a lot of energy during a hunting day, covering as many as three miles in their quest for prey. How does the Small-tailed weasel negotiate the winter landscape? …continue reading Magical Mustelids