The Bowerbird's Stage Made of Sticks and Berries
In the forests of Australia and New Guinea lives a group of birds with an unusual talent for construction. A male bowerbird does not build a nest. He builds a bower, a structure made only to attract a mate, and he may spend weeks getting it ready.
Different species build in different styles. Some males weave sticks into two parallel walls, forming a lane the shape of a corridor. Others pile twigs into a tall tower around a young tree. The area in front of the bower is cleared of leaves and then decorated with colorful objects, such as flowers, berries, shells and bits of bright plastic. Some species pick a favorite color, and one kind uses mostly blue items. The male arranges and rearranges his collection, and he steals decorations from his rivals when he can.
A female visits several bowers before she chooses. She studies the neatness of each structure and the quality of its decorations, while the male dances and calls beside it. A well-built bower probably tells her that the male is healthy and clever, which makes him a good father for her young.
After mating, the female leaves to build an ordinary nest and raise the chicks by herself. The bower has done its job. It is not a home at all but a stage, and it shows how an animal can invest enormous effort in a display.