Feathers of the wing of Falco sparverius

Feathers of the wing of Falco sparverius
from

by

chromolithograph
By Charles Augustus Keeler, engraved by Britton & Rey.

text from the plate

Feathers of the wing of Falco sparverius, showing transition of pattern according to successional taxology. Natural size.

Lith. Britton & Rey, S.F.

del. C.A.K.