84 BIRDS OF SOUTH DAKOTA 
337a. Kriper’s Hawk (Buteo borealis krideri.) 
The Krider Hawk is a subspecies of the Red-tail and 
similiar but lighter in plumage, being nearly white on the under 
parts. It is of the same size and has the same feeding and nest- 
ing habits. A few specimens have been taken in our State. 
339. RED-SHOULDERED Hawk (Buteo lineatus lineatus.) 
As far as we know this Hawk is rare in South Dakota, its 
principal range being east of us. 
Among specimens taken in this range the male is about 
twenty inches in length and the female twenty-two. Farther 
south they are smaller. Above, dark reddish brown, shading to 
rich brown on wings; head, neck, and under parts rufous, more 
or less streaked with light and dark; tail with several light nar- 
row bands, and tipped with white. Young usually darker above 
and lighter below. 
Its feeding and nesting habits are much the samé as those 
of the preceding species and it should therefore be protected. 
342. Swatinson’s Hawk (Buteo swainsonti.) 
In abundance this Hawk ranks next to the Marsh Hawk 
in our State, being rather more common west of the Missouri 
River, where it nests in cottonwood trees along wooded creeks. 
In size it is about the same as the Red-shouldered, viz., 
twenty to twenty-two inches. Swainson’s Hawk has such a wide 
variation in plumage that any description must be of only gen- 
eral application. Adults, on the back, usually plain sooty brown; 
throat nearly white, with under parts buff or tawny, blotched 
with brown of the same shade as the back; flanks usually 
barred; under tail dark slate crossed with several zigzag black 
bars; a wider band near the tip. The young are usually much 
darker, many specimens running to plain soot brown both above 
and below, sometimes showing a rufous tinge and bars on the 
flanks, 
These Hawks are said to nest on the ground and on cliffs 
as well as in trees. Like many of our larger species they will 
at times take possession of a last year’s Crow’s nest. ‘Their food 
consists of mice, gophers, large grasshoppers and crickets. 
