George Bird Grinnell,
Jack the Young Trapper: An Eastern Boy's Fur Hunting in the Rocky Mountains
“ A beaver's foot is made up of a whole lot of pretty strong bones, and I question whether even a beaver could cut through those bones, and then he wouldn't know enough to do it. All a beaver knows when he gets caught is to struggle, and pull, and twist, and turn, and try to get away. Very often, if the traps are not properly set, they do get away, leaving their feet in the trap, but they don't gnaw their feet off ”
