I was surprised once when I saw a chicken, one of the four I had, eat her chicks as they hatched. But then I also saw one of those four chickens (I could not distinguish them), commit suicide after my bad dog killed her three companions a couple of days previous to that. It was a very deliberate act of slowly walking up to my dog staring him in the face all the while. I was in the garden and saw everything. There was enough time for me to tell my dog "No", but he was a bad dog and I couldn't reach them in time. Of course those chickens were tormenting him when he was on a chain.