186 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
Group 5. Wing, over 15 inches long. 
Bill, black; general plumage, tawny black and white; horn-like tufts of 
feathers over the eyes. 
Great Horned Owl. 
Bubo virginianus, and races. 
See No. 309. 
Bill, black; general plumage, white, usually more or less marked with slate 
brown, or dark brown; no horn-like tufts of feathers over the eyes. 
Snowy Owl. 
Nyctea nyctea. 
See No. 312. 
Bill, yellowish; no horn-like tufts of feathers over eyes; general plumage, gray 
mixed with white and dark brown. 
Great Gray Owl. 
Scotiaptex cinerea. 
See No. 304. 
Great Gray Owl. Great Horned Owl. 
