I am soooo sorry you lost your chicks & duck! I once paid a 'trusted' friend to sit with a pet and when I got back my pet was sitting in a pile of filth - alive but I was still hysterical, so I have an inkling of what you are going though. I hope there is a HUMONGOUS reason for what happened - which will not help the birds, but may help you deal with all this. If not, OFF WITH THEIR HEADS!