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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.
House Wrens are very territorial, and will put dummy nests or active nests on top of the nests of other birds, or they will remove the nests and eggs before building their own. To the left - a House Wren removing a Tree Swallow nest before building a dummy nest in the box.