Most animals could be considered both preditors or prey. In the case of the beaver it would most likely be considered as prey. Beavers are vegetarians and do not prey on other animals. Because of this they would not be considered a predator. On the other hand beavers have a variety natural predators such as man,mountain lions, cyotes, bears, wolves, bobcats, and even stray dogs. This fact would make them prey to all of these animals.