1) Birdhouse 2) Dovecote 1) Columbarium 2) Dovecote 
• (n.) A dovecote; a pigeon house.
Col'um·ba·ry noun ; plural Columbaries . [ Latin columbarium , from columba a dove.] A dovecote; a pigeon house. Sir T. Browne. 
columbary 1. A dovecote; a pigeonhole in a dovecote (a structure, usually at a height above the ground, for housing domestic pigeons); a pigeon house. 2. A vault with niches for urns containing ashes of the dead; one of the niches in such a vault.
a dovecote or pigeon house.