Satin Bower bird, Ptilonorhynchus violaceus ; Canberra, Australia; The story is about the transition of a juvenile male to adulthood, over a period of 3 months at age 6 or 7. Juveniles are green and adult males are a shiny blue black. This juvenile had his own bower, which is constructed of twigs. Bowers are used for courtship, and males collect decorations, usually blue or yellow, and use these for display. The display is also used to defend the bower against intruders, such as the adult male in the bower in image No. 6. The bower is a social centre and is visited by many other birds. The visitor goes into the avenue of the bower (even if it is a dominant bird) and the bower owner parades around the bower. In the absence of the owner, other birds use the bower to practice their displays and bower building technique.