 Anti-fur campaigns have protested foothold traps claiming that an animal caught in a foothold trap will frequently chew off its leg to escape the trap, while the National Animal Interest Alliance states that modern foothold traps have been designed to hold animals as humanely as possible to reduce incidences of the animal fighting the trap, possibly injuring itself or getting loose in the process.Some research indicates that in US states that have banned the use of foothold traps, other issues have arisen.In Massachusetts, the beaver population increased from 24,000 in 1996 to over 70,000 beaver in 2001.