many birds are not camouflaged, but stand out with vivid colours. they are usually male birds whose females are dull and camouflaged. the function of the colours is two-fold. first, the colours help them get mates, and second, the colours identify them to other males of the same species. many birds are territorial, especially in the nesting season. they give out territory sounds and are easily seen. this lets other males know they will defend their territory. it sends out a "look elsewhere" signal to their competitors.