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Wetmore, Alexander, 1886-, et al. / Warm-blooded vertebrates
(1931)

Chapter II: adaptations for progression by flying ,   pp. 13-24 ff. PDF (4.7 MB)



PLATE 9
Adult female green-winged teal, showing method of wing molt in which all
the flight feathers are renewed
simultaneously. Photograph by Alexander Wetmore. Courtesy of the Bureau of
Biological Survey


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