No wild animal kills for 'sport'...they kill to eat...True, but raccoons tend to kill for sport and tear open the hen.
many may kill multiple animals in a killing 'frenzy' if the opportunity presents itself, like in a flock if chickens,
then carry them off one by one to cache for later or their pack mates
I'm betting owl..I believe they are head removers.And the fact the head was gone. (Guess he was trying to be nice last night and say it was "pretty much gone" to soften the details)