Tuesday 12 February 2013 9.51pm
Foxes are natural killers, they have to be to survive, but always kill more than necessary when they can as any owner of a raided chicken coop will confirm.
There was a David Attenborough program that covered this. He said it was a myth. If left to it, they apparently go back and get each bird one at a time and bury it in a different place. It just takes quite a while and the dead birds are usually discovered before they get to finish. They had footage of a fox foing it.
It looks like it might have been episode 6 of The Life of Mammals