Male TRES checking out a house wren nest box. It did not fit in this box but moved to another site with a TRES nest box.
Installed along a cross fence on the prairies with an adult looking out of the nest box
Tree Swallow Nest Box Gallery
Tree Swallow & Violet-green Swallow Nest Box Guidelines
For information regarding current research on tree swallow nest boxes that is being conducted by Warne in the Wild go to the Tree Swallow Nest Box Research page.