12 CLASSIFICATION OF BIRDS. 
Suborder 9. CUCULI. 
The Cuckoos may be diagnosed as follows :— 
A. Basipterygoid processes absent. B. Feet zygodactyle. ©. Plantars galline. 
D. Oil-gland present, but nude. 
Other characters may be added :— 
E. Palate desmognathous. 













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The Cuculi have zygodactyle feet, but they are correlated with galline plantars. 
In zygodactyle feet the fourth digit is turned backwards as well as the hallux. The first 
digit is, however, occasionally absent. The following suborders contain species which may 
be regarded as semi-zygodactyle, inasmuch as the fourth digit may be turned either back- 
wards or forwards at pleasure :—Musophagi, Accipitres, Striges, and Coraciz. 
vay 
