The ermine, also known as the stoat, is the second smallest weasel in Alaska at only 7 oz (200 g). Due to their small size and high metabolism, they must eat roughly 40 percent of their body weight each day. Ermine are also known to fiercely defend their food, even from humans.
This weasel changes color by season. In the winter, ermine grow a white coat with only the tip of their tail, nose, and eyes appearing black. In the summer, the black tail tip remains but their coat becomes a light brown with a white underbelly. The least weasel is sometimes mistaken for the ermine, but unlike the ermine the least weasel lacks the black tail tip.