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
War of the Birds War of the Birds War of the Birds () is a Danish animated movie directed by Jannik Hastrup in 1990, about two orphan birds, Oliver and Olivia, who fight against an evil vulture with the help of two mice. It is based on a children's book of the same name from Bent Haller. In a forest lives a community of birds who live peacefully, including a pair of sparrows residing happily in a nest awaiting the hatching of their two eggs. A storm rolls in and a white dove warns the couple about Fagin, a sinister vulture who kills every