Rook

Outside recently it has been like a scene form The Birds with a good proportion of a local rookery invading not to mention half a dozen jackdaws and my normal crows taking up residence. There seems to one particular rook and I wonder whether it's the one from last year, who knows the ropes and is a bit less afraid than the others though any movement at all and they scarper. 

Of course they are coming in for the food and seem to have a preference for fat balls which explains my feeder ending up on the floor most mornings empty.