TRAP
After the kill, a trapdoor drops the carcass and resets the trap.
A squirrel or possum enters a tunnel toward bait dispensed from an overhead timed feeder. Inside, the animal contacts a mechanical trigger that releases a spring-loaded strike bar, which strikes it at the neck. The strike bar also hits a lever, which after a brief delay withdraws a retaining pin holding a hinged floor door shut. The door opens and the deceased animal falls out by gravity, leaving the trap ready for the next animal without operator attendance.
“In tests by the inventors, the Kania trap had an almost 100% kill rate.”— Arthur Randell Bradwell, from the specification
And the world did not beat a path to his door.