The Descent of Man

ornamented with infinitely diversified appendages,
and with the most brilliant or conspicuous
colours, often arranged in elegant patterns,
whilst the females are unadorned. When
the sexes differ in more important structures, it
is the male which is provided with special sense-
organs for discovering the female, with locomotive
organs for reaching her, and often
with prehensile organs for holding her. These
various structures for charming or securing the
female are often developed in the male during
only part of the year, namely the breedingseason.
They have in many cases been more or
less transferred to the females; and in the latter
case they often appear in her as mere rudiments.
They are lost or never gained by the
males after emasculation. Generally they are
not developed in the male during early youth,
but appear a short time before the age for reproduction.
Hence in most cases the young of
both sexes resemble each other; and the female
somewhat resembles her young offspring