Trap for stoats and weasels

There were lots of these traps in the wood. An egg was placed in each box and initially we thought they were for catching possum but then we found a decapitated stoat in one and learnt, from two hikers we met in the wood that the boxes were set for stoats. It is a sad tale - Pakeha imported rabbits as a source of food and fur. The rabbits bred like they do and so they thought let's introduce another mammal to kill them off hence the stoats! These of course also bred like rabbits and now they have a pest that is eating the local bird eggs and causing untold havoc to the local wildlife...