It’s interesting how the birds can be so accurate on their timing. I was wondering since Spring was so early here this year, if that would make a difference.
The chickadees are still active in the nest box. The first year I put it up, a pair moved in and the female laid an astounding 10 eggs before abandoning the box. Apparently they figured they would have too many mouths to feed.
There's a free Audubon app for phones that I use to record all the seasonal first time arrivals as well as any first time sightings of new birds.