Catching stuff with them is just a matter of placement and bait like any other trap. Mammals will mess with them. Mice will drop the trap and then leave.
There are certain clues as to what is messing around with your trap...
Trap fallen over bait that is still there = wind or rain.
Trap fallen over bait that is gone = mice or rats.
Trap fallen over bait that is gone and trap is moved or disturbed = larger rodent
Trap that is totally destroyed, bait still there = a predator got your bird, especially if there are feathers/blood around.
Trap that is totally destroyed, no feathers/blood, bait gone = horse, goat, deer etc.
Trap gone totally missing, bootmarks around trap = someone stole your trap.
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