The main predators of beavers are dependant on region but include bears, wolves, wolverines, lynx, fishers, otters, coyotes, foxes, bobcats, owls, minks, alligators, weasels, hawks, dogs, mountain lions and eagles. However, adult beavers are large, good fighters and can escape into water, meaning that the young are most often targeted. The one exception is humans, which go after adult beavers if they consider them a nuisance.
Beavers cannot move very fast on land, so the beaver's best defense from predators is escaping into water. As a result, beavers are highly alert on land and escape into water at the first sign of danger. They also warn nearby beavers of threats by slapping the water loudly with their tails. Beavers attempt to protect their young, as this is the stage at which beavers are most vulnerable to predators.
Humans work to eliminate beavers in several ways, consciously and unconsciously. Humans have killed beavers for their pelts or because they believe that beaver dams are large and unattractive. They also threaten beavers unconsciously by changing much of their habitat and polluting their ecosystems. If an area is polluted and a beaver receives a wound, the wound may get infected and prove fatal.