Hab. Western region of North America; Mexico.
LIST OF SPECIMENS EXAMINED.
National Museum, 22; Boston Society, 2; Museum, Cambridge, 2; Cab. G. N. Lawrence, 2; Philadelphia Academy, 2; Coll. R. Ridgway, 2. Total, 32.
| Sex. | Wing. | Tail. | Culmen. | Tarsus. | Middle Toe. | Specimens. |
|---|---|---|---|---|---|---|
| ♂ | 8.50–9.85 | 7.50–9.20 | .60–.70 | 2.10–2.75 | 1.30–1.65 | 24 |
| ♀ | 10.20–10.60 | 9.30–10.50 | .70–.75 | 2.65–2.75 | 1.65–1.75 | 4 |
Habits. This common Hawk appears to have a very general distribution over the United States, from South Carolina to New Brunswick, on the Atlantic; from Texas, New Mexico, and Arizona, in the interior, to the Saskatchewan, and from Southern California to Washington Territory, on the Pacific. Mr. Boardman mentions it as found near Calais, but rare. Mr. Verrill cites it as occurring in Western Maine, but not common. I have received its eggs from South Carolina, where it is resident throughout the year. Mr. Dresser met with it not uncommon near San Antonio, and found it breeding on the Altascosa and Medina Rivers. Dr. Coues says it is generally distributed throughout the Territory of Arizona. Dr. Newberry found it common about San Francisco, and extending north of the Columbia River. Mr. A. Schott obtained a specimen on the Colorado River in Southern California, and Dr. Gambel and Dr. A. L. Heermann speak of it as common throughout that State, while Dr. Cooper and Dr. Suckley mention it as frequent both in Oregon and in Washington Territory. A single specimen was taken by Mr. Salvin in Guatemala. Dr. Cooper states that this Hawk is often killed about the farm-yards of Washington Territory, where it seizes on chickens before the very eyes of the owner, darting down like lightning, and disappearing again before he can see what has caused the disturbance. It is said to be a constant resident, and to breed within the Territory.
Nisus cooperi.
Mr. Audubon describes the flight of this Hawk as rapid, protracted, and even, and as performed at a short distance from the ground, or over the forest. It is said to move along in a silent gliding manner, and with a swiftness even superior to that of the Wild Pigeon, rarely deviating from a straight course except to seize its prey, and seldom mounting in the air in circles. It is very bold and daring, Mr. Audubon having known one to attack and kill a cock much larger and heavier than itself. It frequently attacks and kills the common Ruffed Grouse. It breeds in especial abundance in the Middle States, and particularly along the banks of the Potomac River. I have received reliable information of its nesting in Vermont, Massachusetts, Ohio, Illinois, Wisconsin, Maryland, Virginia, and South Carolina, and probably nearly all of the States. Mr. Gosse did not meet with it in Jamaica.
Mr. Audubon states that he found its nest usually placed in the forks of the branch of an oak-tree, towards its extremity. In general appearance it resembles that of the common Crow, being composed externally of numerous crooked sticks, and having a slight lining of grasses and a few feathers. The eggs he describes as three or four in number, almost globular, large for the size of the bird, of a dull white color, granulated and rough to the touch.
Dr. Hoy, in a communication to the Boston Natural History Society, mentions finding four nests of this Hawk in a single season, and his careful observations of the habits of the parent birds enabled him to ascertain that in each instance the birds began to sit constantly upon their nest as soon as a single egg had been deposited, and that, as a consequence, the eggs having been deposited at varying intervals, each one was found in a different stage of incubation from the other. In not a single instance did he visit a nest without finding the parent bird occupying it.