CRESTED - A male Cardinal shows off his shaggy crest. The crest is strictly feathers - some extra long feathers grow from the top of the head and can be raised and lowered at will. Birds with crests use them to communicate, generally raising the feathers when they are excited or aggressive, and lowering them when they are relaxed or submissive. I think this male was being territorial about the water hole because it has been popular with all the birds lately.
