Mountain Beavers are about the size of racoons but not as bright - so no, I doubt if red pepper on your plants would keep them away. Instead you should consider a live trap such as the variety Hav-a-Heart\" and then relocate the fellow to a remote location - near some water if possible. Apples make a nice bait. But keep that Mountain Beaver away from Enumclaw - I have lots of rhododendrons and they consider them an appetizer. If you are having trouble trapping the Mountain Beaver contact your state Department of Wildlife. It is legal to trap them any time of year but the Wild life agents do not have time to trap them for you. They can recommend a type of trap and professional trappers. Mountain Beavers must live near water and are best trapped in winter or early spring before the mating season. They have sharp claws and teeth so beware. You can also search for the underground burrow (usually near large tree roots) and put a mesh fence up between their burrow and your garden. \"