All the Corvids are unusually smart birds, interesting to watch, and all are thieves when the opportunity arises to grab a meal!. It's just what they do. I've had people look at my Magpie Patterns painting (my avatar) and say "nice painting, but we really don't like Magpies. They attack all the other birds at our feeders. We have had Magpies at our feeders for years and have never seen one purposely attack a smaller bird. But, all the smaller birds dash away when a Magpie lands on the feeder. I guess that's what people see when they say 'Magpies attack the smaller birds". Oh well, if we boycotted predaceous birds we would have no paintings of Corvids, raptors, shrikes, etc, etc.