Skylarks and nesting birds

I went for a walk along the old railway line the day before yesterday and heard my first skylark of the year singing.

This year I have four nest boxes in the garden with built in cameras. Three are hole fronted and one open fronted.

I checked them this morning and caught a great tit on camera investigating one of the hole fronted boxes. One of the other hole fronted boxes appears to have had birds roosting in it. The other two, which are the newest, have no activity yet.