Small mammals such as voles, rats, stoats, weasels, chipmunks, gerboas, hares, pikas, and birds. Particularly near water, birds can make up a significant portion of the diet, both ground-dwelling and aerial birds, from pheasants and ducks to songbirds. Hunting is often by horizontal pursuit, rather than the high altitude stoops of the Peregrine Falcon (Falco peregrinus). In Europe, feral pigeons and urban squirrels are the most common prey. Their flight is highly agile and extremely fast as they often hunt close to the ground.