We have a chickadee family living in our backyard nest box. It’s supposed to be a bluebird box, but as we don’t have any of those around, the chickadees took up residence. We get a lot of Titmice (family Paridae) in our yard. They are attracted to our birdbaths. We haven’t fed birds in a while (except for hummers), too costly and messy. But we still get a lot of wildlife if we keep nice fresh water out. Our townhouse garden is small and the house, which my daughter made with her grandpa sits on a railing at the fence. Here’s a pic: 
My daughter happened to check the box a couple of weeks ago and found the nest with some eggs. We didn’t know what kind of bird it was until we noticed the chickadees (Parus carolinensis) going in. I can’t believe we didn’t notice them building that huge nest. It’s several inches tall with lots of moss. Last week I took a pic. I thought that the adults were out–tapped before opening the door–but one was still there. I could just see a pink hatchling next to it. Poor mom/dad. 
Here’s a pic I took today. The five babies have really grown. They are much noisier now, we can easily hear them when a parent arrives to feed them. Mom and dad are quite busy, when one goes out, another comes in. 
I’ll try to post an updated pic next week.