I think we have a merlin falcon. She (he?) has been on the fence (same spot every time) a half a dozen times, but every time I race to get my bird identifier son, she's gone. I think we have it identified now as a merlin. Petite little bird, don't know that it'd try to take on one of our chickens but she sure likes to sit and watch them. Boy she's pretty and it's kind of neat just how close she comes into the yard. She's stealth like too, the dogs race right past her. der.