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CHAPTER XIII.. Secondary Sexual Characters of Birds.

The Descent of Man and Selection in Relation to Sex, Vol. Ii (1st Edition) · Charles Darwin — chapter 2 of 20 · ~27 words · public domain

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SECONDARY SEXUAL CHARACTERS OF BIRDS.

Sexual differences—Law of battle—Special weapons—Vocal organs—Instrumental music—Love-antics and dances—Decorations, permanent and seasonal—Double and single annual moults—Display of ornaments by the males 38-98

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The Descent of Man and Selection in Relation to Sex, Vol. Ii (1st Edition) · The Wunder Library — complete classics, free to read, with narration.