There's nothing to see...

Unless you happen to see the parent birds flitting in and out.

But... The baby blue tits in this nest box built by Nighthawk are getting noisy enough to be heard from 6 feet away.

Hopefully we'll see them fledge. Last time we had blue tits nesting they fledged when we were away for a week so we have no idea how many there were or what happened to them.