Longworth trap A metal (usually aluminium) trap that is used to collect small mammals without injuring them. It consists of a nest-box, in which appropriate nesting material and food are placed, and a tunnel leading into it. As an animal enters it trips a door which falls shut, so it cannot escape and must remain in the nest-box.

Longworth trap A metal (usually aluminium) trap that is used to collect small mammals without injuring them. It consists of a nest-box, in which appropriate nesting material and food are placed, and a tunnel leading into it. As an animal enters it trips a door which falls shut so it cannot escape and must remain in the nest-box.