雄羚羊和雌羚羊通常都有角。
Both male and female antelopes usually have horns.
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雄燕和雌燕共同抚养幼雏。
The female and male swallows rear their young together.
雄鬣蜥在自己的领域范围内会和五个或更多个雌蜥蜴繁殖下一代。
Males are known to have five or more females on their territory for breeding.
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