I spotted this peregrine falcon (Falco peregrinus) today, in an open lot near Broadway & Republican Street here on Capitol Hill.
I think this one is a juvenile bird— it still had some downy feathers on its breast and underbelly.
Falcons have extraordinary speed and maneuverability, and hunt birds on the wing. Their prey also include bats, voles, lemmings, squirrels, rats and lizards.