I keep hearing that mongeese hunt during the day and sleep at night, but its not uncommon to see them crossing the road while driving at night. Plus, if they strike at dawn (Tora, Tora, Tora), we wouldnʻt know when the damage was done.
I thought a cat too, we have several around, but there is definitely no whole big enough for a cat to get in, let alone drag a carcass out. I beginning to think that I am being hit by several problems - man & animal, since no predator would take a 2 lb chicken without even leaving a couple of feathers around as evidence. At least a few of the birds just "disappeared" into thin air. Tomorrow, I try locking the entry gate again!