I love finding hearts in other things, leaves, rocks etc :) It's not that I have a way of identifying the tail puller when he's just standing amongst the flock. But he comes nearly every day and pulls tails or jumps on the back of other Cockatoos and he's the only one who does that, so it's easy to identify him when he does that :)
lol Allison, I'm sure if it ever goes to trail he'll blame it on his childhood ;) But his behaviour is so anomalous, I'm thinking he may have taken a knock to the head. Or maybe he'll go with the defense, some birds are just born bad!