Of course not only humans!
http://www.bbc.co.uk/earth/story/201411 ... bowerbirds
Last summer I cleaned the chimney. It was full of blue razors clothes pegs in the jaybird's nest. They have blue eyes.Picasso Período Azul Bowerbird:
Early Georgia O'Keefe BowerBird:
Andy Warhol Bowerbird:
And Bankster Bowerbird attracting a female )