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A plume are bird feathers or something shaped like birds feathers.
parrots
Some birds, such as a cockatiel, will raise the crests on top of their heads so that they resemble crowns. This indicates that the birds are startled, excited, or alarmed.
so they can blend in with the bright colors of the rainforest
Female birds are always lighter in color and not with bright colors. Male birds have bright colors to attract the females.
Both male and female peafowl have a crest. It is referred to as a crest. ___________ But there is a word in English something like coppet or copper? I cannot find in dictionaries ___________ There are regional English expressions referring to bird crests, and these expressions vary from place to place. Birds who have erectile feathers on their heads are referred to as crested birds, and the feathers in question are referred to as crests. ___________
If by this you mean why do cockatiels have crests then its because it frightens predators, larger birds and if it dislikes a person it may raise it to frighten him/her Cockatiels are small members of the cockatoo family. All cockatoos have crests. These birds may raise their crests when they are startled, or flatten them when they are angry.
Robins' eggs are bright blue. blue birds
Male birds often have bright colors, while the females look more camouflaged to keep them safe.
to attract animals and birds to pollinate
They show off their bright colors to the females.
Blue jays have small crests, and some bluebirds have reddish chests.