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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.
Exact nest dimensions vary depending on the species of hummingbird, the materials used to create the nest and how the nest must be constructed to fit its location. Most hummingbird nests are 1.5 inches in diameter, roughly the size of a walnut, ping-pong ball or golf ball.