I don’t know what it is but I can’t seem to get bluebirds on my trail since 2017. Each year has gotten worse. 2016 I fledged 5. 2017 fledged 5 again. The next year, they built a nest but abandoned after I found a dead female…no injury just dead in box. This year, zip, nada. Not even a sighting there. It’s really depressing. Also usually get tree swallows in my yard. They arrived on Easter Sunday…came by the next two days in the morning. Haven’t seen them since! At least I had the swallows in my yard last year. Now nothing. Maybe there’s still time
Just venting.