I'm no bird expert by any means but it looks a lot like a young Red-tailed Hawk. We have a family of them living here and they do wonders at keeping little critters out of the hostas for me so hopefully your new little friend will stay around and help you with your gardens too.

And he looks hungry!
My owls have been falling down on their job lately....Bunnies are back!
Linda C

I agree with Red-Tailed hawk. We have them around here,also. I also have a huge blacksnake! That may be why voles aren't a big problem. Phil