Wilson once observed one of this species perched on the highest top of a large poplar, and, just as he was about to take aim, it swept down with the rapidity of an arrow into a thicket of briers, where he shot it, and found a small Field Sparrow quivering in its grasp. It is said to be fond of watching along hedge-rows and in orchards, where small birds usually resort. When grasshoppers are plentiful, they form the principal part of its food. The young are fed with the usual food of the parents,—mice, small birds, grasshoppers, etc. It also feeds upon small snakes, but rarely, if ever, touches anything that it has not itself killed, and has been known to reject its prey when, after having been killed, it proved to be in unsuitable condition for food. Mr. Audubon states that the flight of this species is never protracted. It seldom flies far at a time; a few hundred yards are all the distance it usually goes before alighting. It rarely sails long on the wing at a time; a half-hour is its utmost extent. In pursuing a bird, it flies with great rapidity, but never with the speed of the Sharp-shinned and other Hawks. Its cry is so similar to that of the Kestrel of Europe that it might be readily mistaken for it but for its stronger intonation. At times it gives out these notes as it perches, but they are principally uttered while on the wing. Mr. Audubon has heard them imitate the feeble cries of their offspring, when these have left the nest and are following their parents. The young birds, when they first appear, are covered with a white down. They grow with great rapidity, and are soon able to leave their nest, and are well provided for by their parents until they are able to take care of themselves. They feed at first on grasshoppers and crickets. At Denysville, Me., these Hawks were observed to attack the Cliff Swallows, while sitting on their eggs, deliberately tearing open their covered nests, and seizing their occupants for their prey. In winter, these birds, for the most part, desert the Northern and Middle States, but are resident south of Virginia. They can be readily tamed, especially when reared from the nest. Mr Audubon raised a young Hawk of this species, which continued to keep about the house, and even to fly to it for shelter when attacked by some of its wilder kindred, and never failed to return at night to roost on its favorite window-shutter. It was finally killed by an enraged hen, whose chickens it attempted to seize.