When she peered into the entrance, calls could be heard from inside. The female chickadee was standing her ground, refusing to leave the nest box.bluebird build her nest on top of a nearly completed chickadee nest. Though, very brave-hearted, I don't think a tiny chickadee stands a chance when a bluebird decides she wants the nest box.
More seasons with Eastern Bluebirds on this blog: Eastern Bluebird Family
Videos of an Eastern Bluebird family
Carolina Chickadee posts on this blog.
Eastern Bluebird art