Max has caught a bird before. It was a brown sparrow (I think thats what there called, nickname chickadie, sp)... He trotted a round for a bit with it, spit it on the ground, put him paw on it, licked it a few times & then stepped back & let it fly away. I have never seen max harm any birds, but he has learned which birds to chase away from the old lady's feeder. He'll chase the huge crows, pidegons (sp), & black birds. He'll also chase cats away from the feeders. Max has always loved to watch birds, he'll lay on the deck about 15 feet from the feeder & watch the birds eat, chirp, fight & hop around.