. The birds of California : a complete, scientific and popular account of the 580 species and subspecies of birds found in the state. Birds; Birds. The Swainson Hawk Manitoba, south to Chile and Argentina. Winters chiefly south of the United States, but also irregularly northward to South Dakota and western Washington. Distribution in California.—Common migrant, sporadically abundant through- out the State, save in humid coast belt. Common summer resident in Lower and Upper Sonoran zones both east and west of the Sierras but less common on the south- eastern deserts. Less common and probably b
. The birds of California : a complete, scientific and popular account of the 580 species and subspecies of birds found in the state. Birds; Birds. The Swainson Hawk Manitoba, south to Chile and Argentina. Winters chiefly south of the United States, but also irregularly northward to South Dakota and western Washington. Distribution in California.—Common migrant, sporadically abundant through- out the State, save in humid coast belt. Common summer resident in Lower and Upper Sonoran zones both east and west of the Sierras but less common on the south- eastern deserts. Less common and probably breeding in more open situations of Transition zone, and a frequent invader, at the close of the breeding season, of Canadian zone. Not found in winter. Authorities.—Gambel (Bitteo swainsoni), Proc. Acad. Nat. Sci. Phila., vol. hi., 1846, p. 45 (Calif.); Cones, Birds of the Northwest, 1874, p. 355 (syn.; desc; crit.; habits, etc.); Sharp. Condor, vol. iv., 1902, p. 116 (San Diego Co.; nesting habits, etc.). ALL THE LEFT-OVER Hawks are Swainsons. That is, if it hasn't a red tail (B. b. calurus), or an especially long tail {Circus cyaneus hud- sonius), and if it isn't conspicuously black-and-white barred above (B. I. elegans), or below (Accipiter cooperi), and if, and if, and if—why, then, it must be a Swainson Hawk. And at that you'll never know for sure that you hav'n't a young Redtail or an undersized Ferruginous Rough-leg. Knowledge of the Swainson Hawk, therefore, must always be founded on gun-work and maintained by the exercise of that sixth sense, instinct, which comes in varying degrees to veteran ornithologists. Fortunately, two elements of relief are vouchsafed us. The Swainson Hawk is never here in winter (if it is, ship the specimen forthwith to the Museum of Vertebrate Zoology, Berkeley, or to the International Museum of Com- parative Oology, Santa Barbara), and it has what looks like a white Taken in San Luis Obispo County 169O SWAINSONIA Photo by the Au
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, bookyear1923
