leghold trap
Apparatus meant to capture an animal by the paw.
spring 
Elastic metal device that stretches to allow the jaws to spread and contracts to close them when the pan is pushed down.
spring 
Elastic metal device that stretches to allow the jaws to spread and contracts to close them when the pan is pushed down.
jaws 
Metal parts that close over the animal’s paw.
dog 
Lock that keeps the trap open and that automatically activates it when the pan is pushed down.
pan 
Part that snaps the trap jaws shut when pushed down.