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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.
Robins' nests are usually made from twigs, grass and mud. Sometimes you can find unusual items built into a nest, such as dryer lint or string. Nests are usually built between 5 and 20 feet from the ground, and each pair of robins can produce up to three broods per mating season.