This female was originally ringed as an 6F in 2006, near Eakring, and has been caught in the same box five times now with her chicks. You can see several generations of feathers in the secondaries in particular and she was aged as an 8 this time i.e. at least three years old. The box was down in 2010 and had squirrels in 2011. I suspect she used an adjacent Barn Owl box in 2010. (JL)
Now off to do the same in east Lincs. It'll be interesting to see how they compare to here in south Notts.