The gorgets of a hummingbird are made up of flat iridescent feathers that flash bright colors whenever the sunlight is reflected at certain angles. It is only the male hummingbirds which have these iridescent feathers. The gorgets will serve many important purposes. The hummingbird lacks a "song" so the male will use the gorgets to help them attact the female during courtship displays. They are also used as a way to threaten territorial intruders. Gorgets are also used to help identify various hummingbird species.