This style of trap was developed during the 1950's and has steadily increased in use due to the versatility and effectiveness of the trap design. Duke Body Traps are widely accepted by state and federal wildlife agencies as the most effective humane traps for beaver population control. Meets AIHT Standards. Rotating jaw trap that is used to quickly catch and dispatch wild animals. For use on: Beavers, Bobcats, Coyotes, and Otters.