Raptors are of no significant influence. So if you want to mitigate the damage done by nuisance beavers, you'd better find a local trapper and buy him a cup of coffee. He has short ears, webbed feet, a rich brown fur that acts like a wet suit, and a unique, paddle-shaped, scaled, hairless tail. The multi-purpose tail is slapped on the water to warn other beavers. It's a prop when he stands and a rudder when he swims.
Thin membranes protect the beaver's eyes when underwater.
Internal valves automatically close within the ears and nose. Lips seal tightly around the incisors, an adaptation for feeding underwater, and those teeth grow continuously. No wonder the beaver must gnaw, it's keeps those long teeth worn down. There's a pair of large cent glands around the anus. They produce castoreum oil.