Bird nest July to September), it is not in others, and the swiftlets are declining in areas where the harvest reaches unsustainable levels. Some species of birds are also considered nuisances when they nest in the proximity of human habitations. Feral pigeons are often unwelcome and sometimes also considered as a health risk. The Beijing National Stadium, principal venue of the 2008 Summer Olympics, has been nicknamed "The Bird Nest" because of its architectural design, which its designers likened to a bird's woven nest. In the Victorian era, naturalists often collected bird's eggs and their nests. The study of bird nests is
The Battle of the Birds noon, and the prince fell asleep, but the byre was clean when he woke. The giant knew he did not clean it, but set him to thatch it with birds' down. The prince tried to hunt the birds. At noon, the daughter put him to sleep again, and the roofs were thatched with feathers when he woke. The giant knew he had not done it, and set him to fetch down a bird's nest. He tried to climb it and got no more than half way. The daughter built him a ladder of her fingers, and when he got it