I think my blues have a new nest underway:

This started out with a circle of debris from my hickory tree, these stringy things which i think are the spent male flowers. Now it has the circular grass on top. This is in another peterson box, its hole was enlarged by a woodpecker but i put a metal 1 1/2 guard over it.
The mom i saw perched on the box and she is still coming to eat mealworms.
i have an infestation of wrens. I mean every step in the yard i hear three or four of them, apparently offspring. I am determined now to remove sticks ASAP when i see them.
Chris
SW Ohio