Bird
Birds come in many different colours. These colours can be useful to a bird in two ways. Camouflage help to hide birds from predators. Brighter colours can also be useful to birds. They can be used to identify the bird to others of the same species. Male bird are often brightly coloured while the female is camouflaged. The logic is as follows: the female carries the "precious package" of developing eggs. The male has to defend a territory. His colour and song are used to let others know that "this place is occupied".