I am a member of the Burlington Bird Club and monitor 20 of close to 100 bluebird boxes along the club’s bluebird trail. While checking this particular box, I tapped the box and nothing flew out. I opened the box and did not see a bird until I went to gently tip the basket to count the eggs. And then a chickadee popped out of the nest but refused to leave! I couldn’t see the eggs so I took a quick picture to see how many she was guarding. This is one attentive chickadee momma!