A birdhouse entrance is provided with an entrance opening having two posts projecting vertically from the bottom edge of the opening toward the top edge. The two posts are spaced apart such that a bird of selected size cannot pass between them without opening its wings. Sufficient clearance for the wings is provided between the outer edges of the posts and the side edges of the entrance opening.

The purple martin birdhouse assembly of the present invention includes a plurality of gourds suspended from an array of tubular members. The array is connected by tubular radial arms, from which gourds may also, optionally, be suspended to a central sleeve which is slidably mounted on a pole. The entire array attached to the sleeve may be raised and lowered by a winch and associated pulleys. Undesired rotation of the sleeve, according to a preferred embodiment, is prevented by means of solid, tubular members mounted on the pole which allow for upward movement of the central sleeve but which project downwardly into position adjacent to the radial arms to prevent both clockwise and counterclockwise rotation.

The invention relates to a punched out sheet for use in making a bird-nesting box without using tools or other aids and to a bird nesting box made from the same. The sheet has an interconnected outer part and an inner punch-out part. The outersheet has a carrier handle and devices for adjustment and reinforcement of the entrance and exit hole of the box. The inner part has bipartite suspension devices, a surface device in the form of a ladder and a transverse device in the form of a guard against predators.

A bird feeder comprising an outer enclosure having one or more access ports to the interior of the enclosure and an insert mounted for telescoping movement into the interior of the outer enclosure. The insert is formed with at least one compartment for storing feed with one or more openings into the insert adapted to permit access to the compartment. The insert is dimensioned to define a collection space between the outer enclosure and the insert when the insert is telescoped into the interior of the outer member. The collection space accumulates feed spilled from the compartment by feeding birds to prevent wastage. The insert is movable between a first raised position in which the openings in the insert generally align with the access ports of the outer enclosure to permit feeding by birds, and a second lowered position in which the compartment of the insert is positioned to automatically receive spilled feed from the collection space.