Yay! First sighting of the male back to the box. I'm assuming that this is the same guy as last year. Is there any way to tell (did not get to band the adults last year)? Match spot patterns on the back with photos from last year?
Does the Peregrine Fund have a recommended Kestrel nest box design? I'm sure I can find resources on line, but though I'd check first to see if you have recommendations. Also, how large a field is required to attract and sustain a pair of Kestrels?