A birdbox is a human-made, usually wooden box used as a house for birds. It is suitable as a bird home because it is similar to a natural bird home, such as a hollow tree, and birds often make nests inside birdboxes. Birdboxes are often put on trees. They are often made by people who are fond of birds, but they are also useful for studying birds. For domesticated birds, birdboxes are often used for breeding.