当一物种演化出与生存似乎无关的特征时，如：鲜艳的颜色或超大的角，通常只有雄性动物才能炫耀这些特点。
WHEN a species evolves traits that seem to have little to do with individual survival-bright colours, say, or oversize horns, it is typically the male alone who sports these excesses.
当一物种演化出与生存似乎无关的特征时，如：鲜艳的颜色或超大的角，通常只有雄性动物才能炫耀这些特点。
WHEN a species evolves traits that seem to have little to do with individual survival-bright colours, say, or oversize horns, it is typically the male alone who sports these excesses.
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