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Beaver: by the late 1800s, Beavers’ numbers, as well as all of North America were low due to fur trade exploitation. A period of resurgence in Yellowstone occurred in the 1920s, probably because of protection from hunters and abundant aspen trees. By the 1950s, a decline in aspen and other factors caused a beaver population to fall seriously. Since that time the beaver population has remained relatively low and has been mostly dependent on willow, a more stable, less-depletable food source. In 1996 an aerial survey of the entire park in showed about 50 active colonies.

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Bald eagles are one of two species of eagle in Yellowstone; the other is the golden eagle. They are raptors and carnivores, seeking a diet of fish, waterfowl, rodents and small mammals. They also scavenge from the carcasses of large animals such as elk and bison. 

The Mountain Goat is not a true goat, but belongs to a group known as goat-antelopes. Its hooves are well adapted for rocky peaks, with a sharp outer rim that grips and a rubbery sole that provides traction on steep or smooth surfaces. Traversing peaks and narrow ledges at a stately walk or trot, a Mountain Goat may seem to move across the face of an almost sheer cliff. However, individuals have been known fall to their deaths. On warm
days, the animal will bed on a patch of snow, in a shady spot, or on a mountain ledge. Goats spend much time taking dust baths in dry wallows, particularly in May and June. Only the golden eagle can attack this species in high mountains; it may try to drive a kid over a cliff. Carnivores such as the Mountain Lion may attack the Mountain Goat as it descends into a valley, but the goat’s sharp hooves make it dangerous prey. Mountain goats are stout bodied with a thick coat made up of white hairs with some brown intermixed dorsally. The pure black horns are around 200-300mm long, rather thin, and present on both sexes. They weigh 46 to 136 kilograms.