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These accessory sex-serving traits undoubtedly survived because of their usefulness in external adornment for attracting attention in courtship, in the metabolic requirements of sex combat and the sex act, and in the necessities of caring for the young, until well-grown. The rooster's comb and spurs, the male frog's claspers, the stag's antlers, and so on, are familiarly and obviously so useful.
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