Not sure if anyone else is a birder, but we just had our first ever Bluebirds fledge from our box out back yesterday. Very exciting. For 3 years we've had tree swallows move in and have babies and leave, which is awesome - they are amazing as well. I've had two boxes out there because they say you can get both BB and TS. Well, this year we actually did. 5 BB babies left the nest into flight today (beehive right in the background!). The tree swallows are just now starting to incubate their eggs before they will all leave in June. But it looks like the male bluebird is already reclaiming the box for a possible round 2.