This might be under your home's roof peak, on the side of a tree trunk, or on a designated pole. Pre-Built Options, ...

these are species that build their nests in pre-existing cavities in tree trunks, fence posts or rocky outcrops. "They can't excavate that cavity themselves, and they can't just build a nest ...

aggressively chasing whatever intruder gets too close to her nest. Called obligate secondary cavity nesters, these are species that build their nests in pre-existing cavities in tree trunks ...