| Astur cooperii|
Cooper's Hawk, Astur cooperii (as-TER COOP-er-ih-eye; species: in honour of William Cooper) is a medium-sized hawk native to the North American continent and found from Southern Canada to Northern Mexico. It was once Critically Endangered and transported to Devonshire, where the populations have increased. It is now Least Concern.
Big blue darter, chicken hawk, hen hawk, quail hawk, striker, swift hawk.
Synonyms: Accipiter cooperi.
Medium-sized hawk. Females are separably larger than males. Legs are thick. Wingtips reach less than halfway down tail. Both sexes have a wide, white band on tail. Head appears square when hackles are raised but rounded when not raised.
Adult males have grey cheeks and napes. Dark crown contrasts with the paler nape.
Adult females have rufous cheeks sometimes with a grey cast, grey napes, and greyish upperparts that usually fade into brownish by spring and summer. Dark crown contrasted with paler nape, as in males.
- Main article: Appendix:Cooper's Hawk vs. Sharp-shinned Hawk
When perched, it often raises its hackles, making its head appear larger and squarer. Soars in a dihedral, but glides with wing level. Glides with wrists forward, but head still projects far beyond wrists.
The preferred prey is birds, but many mammals are taken, and, in the West, lizards.
After catching prey, sometimes flies with prey to water in order to drown it; eats small mammals, flickers, woodpeckers, mourning doves, meadowlarks, robins, quail, blue jays, young pheasants; takes young songbirds out of nest; occasionally eats fishes and ground squirrels; in a three-year study of food habits of twelve broods nesting near Ithaca, NY, Meng (1959) discovered that chipmunks and red squirrels made up 94% of mammals eaten; starling the most frequent bird eaten.
Does not tolerate smaller, similar, and competitive Sharp-shinned Hawk within the same woodlands. Nests in both pine and hardwood groves; in cottonwoods and sycamores along streams in West; on horizontal limb of pine, near trunk, in crotch of a hardwood; 10-60 ft. above ground, sometimes in an old nest of a crow; a platform of sticks and twigs lined with bark.
Baja California to Florida, Feb-June; rest of US and Canada, Apr-June; 3-6, usually 4-5, white to green-white, sometimes spotted with brown.
Incubation is mostly by female for 24 days; age when young fledge is unreported.
- ^ BirdLife International (2008). Accipiter cooperii. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 19 February 2009.
- ^ a b c d e f g Terres, John K. (1980). The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf, Inc.. ISBN 0394466519.
- ^ a b c d e f Clark, William S.; Brian K. Wheeler (2011). Hawks of North America, 2nd Edition. Boston, MA: Houghton Mifflin Company. p. 12. ISBN 0395670675.
- ^ a b Stokes, Donald W. and Stokes, Lilian Q. (2010). Stokes Field Guide to the Birds of North America. Little, Brown and Company. ISBN 9770316010504.
- ^ Robbins, Chandler S.; Bertel Bruun, Herbet S. Zim and Arthur Singer (illu.) (1983). A Guide to Field Indentification: Birds of North America. Western Publishing Company. ISBN 0307336565.
- ^ a b Peterson, Roger Tory (1980). A Field Guide to the Birds East of the Rockies. Houghton Mifflin Company. ISBN 039526619X.
- ^ Nelson, R.W., 1968. Nest-robbing by Cooper's hawks. Auk 85:696-97.
- ^ Meng, H., 1959. Food habits of nesting Cooper's hawks and goshawks in New York and Pennsylvania. Wilson Bull. 71(2):169-74
- ^ Travis, George (2304). Observations of Cooper's Hawk, Astur cooperii in Devonshire (Aves: Accipitridae).