General Discussion : New Kestrel nesting

Hi There,

First time poster. I installed a Kestrel box on a utility pole on our farm property last year. I was delighted to see an adult Kestrel frequenting the area this spring. I checked the box and found 5 young nestlings yesterday. The adults were seen actively going in and out through the day. Of note is the fact that the adults carried in a significant amount of dry grass to the box. Is this common? From what I have read Kestrels do not normally add nesting material. 

RP