The male Cardinal is beautiful in his bright red color. The female has only a small amount of red and is mostly a reddish brown. They both have a distinctive crest. They are about 7.75 inches in length. Their favorite food is the Sun Flower seed. Although birds do no have teeth, the Cardinal has a hard, sharp ridge in the roof of its beak that is used to split open the hull of a Sun Flower seed. Often times, Cardinals search on the ground under a feeder for dropped seeds. Although the males readily come to a feeder, the females are more likely to stay on the ground. They do sometimes come to the feeder also. Males are usually aggressive to other Cardinals, especially other males. A male may have the attitude that he owns your feeder. However, his aggressiveness is usually only directed against other Cardinal pairs. Juveniles are a dusty brown.