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
Birds in the Spring Birds in the Spring Birds in the Spring is a "Silly Symphonies" animated Disney short film. It was released in 1933. Various birds are seen building nests and caring for eggs. One pair anxiously awaits the hatching of three eggs, then joyfully summon all the other birds to see their new, noisy hatchlings. Time jumps forward to when the hatchlings are fully fledged, learning to sing and fly. One becomes lost and explores the ground, encountering grasshoppers, humming birds and then a rattlesnake that attempts to eat the baby bird. The bird manages to lead the snake into tying itself