288 HAWKS, EAGLES, AND KITES 
Falconide. Of the former, twenty-two species are North American. 
These present much diversity of form and habit, but our eastern species 
of the genera Buteo and Accipiter may, in the Northern States, at least, 
be seen during the migratory seasons, traveling in scattered flocks, which 
may take hours to pass a given point. At other times of the year, with 
few exceptions, they are solitary birds, having no intercourse with their 
kind. During the breeding season many species have definitely bound- 
ed haunts, upon which intrusion by individuals of the same species 
is not permitted. With much regularity they return to the same locality 
and even the same nest year after year, and some species are known to 
mate for life. Their days are an unceasing vigil. At all times they are 
on the alert for food. With the Buteos this consists to a large extent of 
small mammals and insects, birds and poultry forming a compara- 
tively insignificant part of the diet of most species. Most Hawks are 
thus of great value to the agriculturist as the natural check upon the 
increase of the myriads of small rodents so destructive to crops. 
The cries of Hawks are generally loud, startling, and characteristic 
of their fierce natures. They strike their prey with their feet, and use 
the bill to tear it into fragments. 
Hawks’ nests are generally bulky affairs, composed of coarse twigs 
and sticks. The presence of downy feathers gives evidence that they 
are,or have been recently occupied. The young are hatched with a 
scanty growth of white down which soon covers the body. 
To facilitate identification in the field, the Hawks of this and the 
following families (Falconide, Pandionide) have been placed in one 
key as below. 
KEY TO THE SPECIES 
I. Wing over 19°00. 
A. Upper half of tarsus feathered. 
e Whole head and neck white. . . . . 352. Baup Facts (Ad.). 
. Head or neck brown or brownish. 
ae Bill mostly yellow freeman )e: . 351. Gray Spa Eaate (Ad.). 
62. Bill black or blackish . . . . 852, Bap Eaatz (Im.). 
B. Whole tarsus feathered . . 349. Goupen Eacue. 
II. Wing under 19°00. Placed in three sections as follows: 
Underparts more or less streaked and spotted, without cross-bars. 
2. Underparts with more or less numerous cross-bars. 
3. Underparts without streaks or bars. 
1. Underparts more or less streaked and spotted, without crossbars. 
A. Outer primary with numerous black or blackish bars. 
a. Wing under 10°00. 
@, Back bright rufous, with or without black bars. 
360. Sparrow Hawk. 
a*, Back bluish slate-color. . . . 3857, Picron Hawk (Ad.). 
a’, Back fuscous, second primary longest. 
357. Prazon Hawk (Im.). 
a. Back fuscous, fourth primary longest, tail-feathers of nearly equal 
length; wing under 9°00 . 332. SHaRP-sHINNED Hawk. . (Im 
a’, Back fuscous, fourth primary longest, outer tail-feathers half 
an inch or more shorter than the middle ones; wing over 9°00. 
333. Coopmr’s Hawk (Im.). 
