The steel jaw trap is one of the cruelest devices invented by man. It can be hidden under grass along a well-trodden animal path, under water, or among the leaves of a tree. When triggered by an animal's weight, the heavy steel jaws spring shut over a paw or a leg with such force that bones are sometimes broken. Some leghold traps contain sharp steel teeth that pierce all the way through flesh and muscles.
"Special Report on Trapping" (1973). HSUS SPECIAL REPORTS. 12.