178 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
Wing, always over 18.50; belly and thighs, never white; oniy adult birds have 
the hood and tail, white. 
Bald Eagle. 
Haliaetus lewcocephalus. 
See No. 285. 
Section 3. Fourth primary, longest; tarsus, without 
feathers. 
Back, brown; face, bare. 
Audubon’s Caracara. 
Polyborus cheriway. 
See No. 297. 
Section 4. Fourth primary, longest; tarsus, partly (not 
entirely) feathered. 
Tail, rufous brown (adult); tail, whitish or grayish, with numerous brown bars 
(immature). 
Red-tailed Hawk. 
Buteo borealis, and races. 
See No. 271. 
General plumage, dark sooty brown, sometimes with pale underparts, more or 
less streaked and spotted. 
Harlan’s Hawk. 
Buteo borealis harlant. 
See No. 274. 
Wing, always over 18.50; only adults have head and tail white. 
Bald Eagle. 
TTaliaetus leucocephalus. 
See No. 285. 
Section 5. Fourth primary, longest; tarsus, entirely 
feathered. 
Thighs, tawny, more or less streaked or barred. American Rough-legged Hawk. 
Archibuteo lagopus sancti-johannis. 
See No. 281. 
General plumage, sooty brown or black (black plumage). 
American Rough-legged Hawk. 
Archibuteo lagopus sancti-johannis. 
See No. 281. 
Thighs, tinged with deep rufous with numerous bars. 
Ferruginous Rough-legged Hawk. 
Archibuteo ferrugineus. 
See No. 282. 
