Peregrine Falcon

I just saw a big bird in the hemlock tree when I let Lily out in the big yard to pee. It looked almost like a red-tailed hawk but it was smaller. It was barrel-chested and had a flecked white chest. When it flew away I knew from its wing-span that it wasn't a hawk. I looked in my bird book. It was a Peregrine Falcon. This is a rodent-eating cosmopolitan bird. Lily was looking around and sniffing the air. Bill says she could smell that the bird had been here.