Subfamily CYPSELINAE

This includes the typical Swifts, in which the hind toe is completely reversible, and the third and fourth toes have only three phalanges each. Sexes always alike. Two genera are Indian.

Key to the Genera.

a. Toes all directed forward as a rule……………….CYPSELUS, p. 164.
b. Toes in pairs; inner and hind toes directed inwards, the other two outwards……………….TACHORNIS, p. 170.

BookTitle: 
The Fauna Of British India including Ceylon and Burma
Reference: 
Blanford, William Thomas, ed. The Fauna of British India: Including Ceylon and Burma. Vol.3 1895.
Title in Book: 
Subfamily CYPSELINAE
Book Author: 
William Thomas Blanford
Year: 
1895
Page No: 
163
Volume: 
Vol. 3
id: 
1486

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