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Pendulous Nests. Pendulous nests usually have a round or oval nest area with a neck that suspends from the tip of a branch. The neck of a pendulous nest varies in length and width depending on the bird. Different birds create entrance holes in different areas of nest.
A few birds still nest in caves, but 99% of the breeding Barn Swallows in Washington now build their nests on eaves, bridges, docks, or other man-made structures with a ledge that can support the nest, a vertical wall to which it can be attached, and a roof.