Our garden always has an abundance of Chestnut-backed Chickadees, who share the habitat all year round with Black-capped Chickadees, Nuthatches, Bushtits, and Juncos. So we have always assumed they must be making nest cavities close by.
This year, a pair have taken to a hole in our dogwood tree. They are using a hole started by Norther Flickers, and in fact it is only a few inches about the nest cavity that was actually used last year by the Northern Flickers. So what happens if the Northern Flickers return? Maybe we will find out.
Here’s a video of the Chestnut-backed-Chickadee working hard on the nest cavity: