This is the second year for our purple martin house. The first year we only had light interest from what I'm assuming were local juveniles, late in the season. This spring we had a pair that moved in and raised two clutches. Up until a couple weeks ago, we'd regularly have eight or so martins living here.
When the martins are hanging around, the noise is incredible. When they decide to pick up and leave, they pick up and leave...and it gets very quiet. It got very quiet last week. And then a couple days later the chattering was back and I saw 20 martins sitting on the power lines. And a day or so later they left.
Next thing I knew, 20 more martins were buzzing around. And then they left. And today there were 22 on the wire (and maybe even more in this picture now that I look closely). I guess we meet approval and have become an official stop on the migration tour.
I love that :-D.