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Nesting Box Dimensions & Hole Sizes

While not all species of birds use a nesting box, those that do are often particular about the one they will use.  Among other factors, birds will take into account the dimensions of a nest box, the height that the box is mounted at, and the entrance hole size when deciding whether to use a nesting box.  The following information from the Cornell Lab of Ornithology and the U.S. Fish and Wildlife Service's Migratory Bird Program will help you choose a nesting box with the proper dimensions for the birds you are trying to attract.