(under subclass 65) Traps whose entrance is normally open to the free passage of the animal, but is closed automatically as soon as the animal is within the trap; there is a second entrapping compartment designed to receive the animal, which is frightened by his capture in the first compartment; as soon as the animal enters the second compartment or leaves the vicinity of the trap entrance the latter resumes its open state; but the arrangement is such that if the animal turns back the entrance closes in front of him.