两性异形
两性异形（英语：Sexual dimorphism），也称性别二态性，是指同一物种雌雄两性之间个差别。最基本个两性异形是生殖构造（第一性征），但因为所有有性别个生物侪有生殖构造个差异，一般来讲两性异形主要用拉指其他搭生殖没直接关系个特征（第二性征），包括体型、颜色、用作求偶或打斗个身体器官，如装饰羽毛、鹿角、犄角搭獠牙等。
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