A locking device for releasably securing a birdhouse upon its mounting pole. A locking plate secured to the bottom of the birdhouse has an opening through which the mounting pole is passed. The plate opening is larger in diameter than the outside diameter of the post. The plate is biased into a locking position at an angle relative to the axis of the post. A pivotal bracket is operable on the plate to bias the plate to a horizontal release position normal to the axis of the post. A lanyard secured to the bottom of the birdhouse is passed up the pole around a pulley wheel at the top thereof and returned down the pole through the bracket. A free end of the lanyard extends below the bracket. Pivoting of the bracket and resultant release of the locking plate is accomplished by pulling on the free end of the lanyard at an angle relative to the post to move the locking plate to its release position.

A birdhouse is herein provided comprising a vertically split structure having at least two separate components. Each component presents a portion of a chimney extending from a roof portion of the structure. A removable clamping member, in the nature of a chimney cap, is secured to the outer, upper marginal edges of the chimney to urge the components of the vertically split structure horizontally together. The components are further formed to present a downwardly extending collar portion for axially receiving a birdhouse supporting post. The collar, which is of an axially split configuration due to the vertically split nature of the overall structure, may be clamped by a removable strap or the like to frictionally engage the cylindrical surface of the post. In one feature of the invention, an upper marginal surface of the chimney is formed with a plurality of protuberances to hold the chimney cap in spaced relationship to the marginal edge of the chimney to define a ventilation path from inside the birdhouse through the chimney and out under the chimney cap.

A modularly stackable centrally ventilated bird house that includes a main portion, a ventilation system, and a base. The main portion includes a lowermost floor, corner posts, lower peripheral perches, a pair of lower internal perches, an uppermost floor, upper peripheral perches, a pair of upper internal perches, and a ceiling. The ventilation system includes a stub venting-tube that together with a throughbore in the lower floor allow the modularly stackable centrally ventilated bird houses to be stacked, four lower compartments, four lower dowels, four upper compartments, four upper dowels, and a vent cap. The main portion further includes a pitched roof that is selectively disposed on the ceiling and which has a pair of gable ends that have vent throughbores therethrough. When the pitched roof is utilized, the vent cap is removed and air exiting the stub venting-tube exits through the vent throughbores in the pair of gable ends of the pitched roof and out into the ambient.

An erectable bird feeder which may be lowered for the filling or replenishment of bird feed and elevated to a fixed position for feeding use. The elevating mechanism includes fixed and pivotable support members connected by a hinge which may be locked to hold the feeder in working position. The pivotable member carries a baffle and frame from which the bird-feeding station is suspended. The disposition of the hinge relative to the station is such that the station remains level in all positions.

An improved plastic colony bird house with nesting compartments, especially for purple martins. This invention is made of two main sections: a round outer shell that rotates about and is easily removed from the second main section, an inner core of pie shaped nesting compartments. The removal of the outer shell facilitates the easy cleaning of the nesting compartments with a simple garden hose at the end of the nesting season. The outer shell has multiple ingress and egress holes of sufficient size to allow easy access. The vertical wall dividers, separating each nesting compartment, feature a short horizontal plane making a tee structure. The outer shell can be rotated to the closed position, which places the tee structure at each entrance hole, thus blocking the entrance to the nesting compartments to unwanted species of birds. When the first migrating purple martins are seen in the area, the outer shell can be rotated to the open position to allow entrance to the nesting compartments. This invention features an improved, segmented pole using pressurized air from an air compressor to raise and lower the bird house. Air pressure is superior to the use of water pressure as the air will not freeze in cold climates. In addition, the use of tight fitting reducing collars and a small hole at the air pressure intake site, allows for the controlled descent of the birdhouse at the end of the season to keep from causing injury to the person maintaining the bird house.