Peregrines in flight

I have had numerous opportunities to photograph Peregrine Falcons this year. These "in-flight" shots were taken under the terms of my Schedule 1 license which licenses me to photograph this species in the nest territory.

Here's another shot of the "tiercel" as it patrols above it's territory. The thing that impresses me about a Peregrine in flight is the way that the head is kept very still in flight.