Bird Bottles are birdhouses shaped like a bottle/jar. Different size openings for different birds. They hang horizontally from the side of a garage or shed for instance. They have a perch. Birds like Martens, etc. The bottom or back is open and rests against the wall of the garage/shed, the nail to hang it up with goes in the pointed area at back. $15 each. Brand new, never nested! 3 different size bird openings. Aqua measures 8" tall, 1 1/2" bird opening, 17 1/2" around belly, base (against a wall) 3 3/4". Brown is either 2 1/4" bird opening, 17" around belly, with 4 1/4" back (against wall) and 9" tall, or 3" bird opening, 16 1/2" around belly, 9" tall, and 3 1/2" base (against wall). Opening in back is for circulation and a point for mounting. Location: Aurora, IL