Perhaps the bird is just hanging out for a few days because he or she thought it was a good place to hunt for mice. Or maybe pigeons? do you have any Rock doves or Mourning doves hanging out in the barn?
Anyway, you are not alone. I found a blogger who had a hawk visiting in their barn for a few days. Eventually it flew out the door.
http://thekitchensgarden.com/2...
(Note to self: when I become a famous designer of barns, remember to include a remote controlled 'hawk escape window' when planning the design.)
