Along the way, you will get to observe and monitor other users of nest boxes that may include tree swallows, chickadees, wrens, titmouse, and others. (massaudubon.org)
In spring and summer, look for Eastern bluebirds and Tree Swallows around the nest boxes. (massaudubon.org)
To test their hypothesis, the researchers presented nestling tree swallows (Tachycineta bicolor) with audio recordings of a parent warning of a predator or announcing a food delivery. (sciencedaily.com)