134 Field Museum of Natural History — Zoology, Vol. IX. 



Size, large; eyes, not surrounded by radiated disk of feathers; 

 plumage, black or dark brown; hind toe, short; claws, not sharp; 

 head, bare in adult. Family CATHARTIDiE. Vultures. 



See page 141. 





Eyes, not surrounded by radiated disk of feathers, as in the Owls; 

 toes, armed with talons; head, not bare. 



Family FALCONIDiE. Hawks, Falcons, Eagles, etc. 



See page 143. 



Eyes, surrounded by 

 radiated disk of feathers; 

 plumage, soft; bill, hooked; 

 toes, armed with talons. 



(a) Middle toe nail with comb-like edge. 



FAMILY ALUCONID^. Barn Owls. 



See page 157. 



(b ) Middle toe nail without comb-like edge. 



Family STRIGID^. Horned Owls, Hoot Owls. 



See page 155. 



