Who doesn't love beavers? They are a major keystone species of the environment. Beaver ponds force more water to the aquifer, helps the local area survive droughts, and provide new aquatic homes. Beavers will create little irrigation canals that helps water local areas.
Beavers are awesome, they're also have the unfortunate combination of being cute and territorial. They're quite dangerous, so if you ever spot one, give it space.