The beaver, Castor canadensis , is a large rodent with a paddle like tail, webbed hind feet, and thick brown fur. Beavers are found wherever there is a permanent stream of moderate grades and sufficient food. I have even seen them in Cherry Creek near the Cherry Creek Mall.
Beavers are mainly nocturnal.
Some biologists believe they became nocturnal in the 1800 s due to heavy trapping. They spend most of the time in the water which serves as protection. They are excellent swimmers, however, they are very awkward on land. Their food source is aspen, cottonwood, and willow roots, which usually grow in abundance around riparian areas. After eating the bark, they will carry the wood to build their lodge and dams.