Talk about a sharp looking birdhouse, we’re sure you’ll be barreled over by this killer cactus! A perfect place to nest and rest for our passerine pals! The 1.25" hole is sized for use by small birds but can be slightly enlarged to appeal to larger birds such Bluebirds and Tree Swallows. Birds might also pull at the wool to use in making their own nests. Hang one up and see what happens!