Found all of my 6 quails dead an hour ago. All but one had heads missing and good 2.5 inch whole in the wire mesh cage with wires pulled inside. One bird was eaten in a two inch diameter others just had missing heads, could not find the heads anywhere around.What could it be? Rat, Mongoose etc.There was a poop lying near the cage about 1.25 inches long and half an inch thick, pic is attached. All happened during night as the birds were stiff.