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Wolverine The largest member of the weasel family is the "street fighter" of the forest. A wolverine (Gulo gulo) will confront mountain lions or bears to protest its share of a carcass. The wolverine can be a ferocious animal, and it has been known to chase off larger predators from a carcass. The wolverine's brawny frame sits low to the ground, and it can weigh as much as 50 pounds. Sometimes, wildlife watchers will take it for a small bear. Look for patches of light, grayish hair on the flat top of the wolverine's head, and a brown or yellowish streak down the back that extends nearly to the rump. Wolverine are so scarce in Yellowstone that any observation should be reported to park biologists.
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