big cats in cages

Spoke to friends of ours..large cat has entered the cage and managed to get its arse caught in the trap door and wiggled out..solution..they have made the cage longer, Locked the trap door up and started leaving meat inside..the other night a 30 kg wallaby was dragged out...they will leave food further and further inside the cage until the animal feels safe to go to the back and then reset the trapdoor.
Could be the proof we have been after for a long time..!!