do i need a lock on the outside lid of the nest box? they are protruding from my coop - so i can lift the lid and collect the eggs. thanks for any advice. NEW: 3-20-09 i put a closure on it that can be turned and i can put a lock on it - but will i need to. a predator would have to turn it 90 degrees and then lift the lid!!! could a predator do this?