The Greater bowerbird, NT. Is a omnivore, feeds mainly on insects berries and seeds.The bower is built and maintained by the male. mating ritual around attracting a female is around the bower. The male woke us up with the racket he was making around the bower trying to impress the female. First time I've seen the pink crown plumage on a pretty drab bird.
The stuff in and around the bower is the males idea, of furniture to attract the female This one liked snail shells grey slivers of rock and green seeds.
Had a bower near one of my safari camps and after a couple of seasons he had collected a few empty cases. Interesting to watch their behaviour.