在繁殖季节，雌性改变身上的颜色。
这种鸟雄性比雌性更加色彩艳丽。
这个物种的雄性和雌性几乎无法分辨。
The male of the species is almost indistinguishable from the female.
雌激素是一种雌性荷尔蒙。
每只雌性在4月或5月份将只产一颗卵。
他们想让这些雄性动物和野生的雌性动物交配。
挪威的捕鲸人昨天说他们用捕鲸叉捕获了一头雌性小须鲸。
Norwegian whalers said yesterday they had harpooned a female minke whale.
这个物种的雌性是非常好斗的。
曾被研究过的雌性恐龙也是这样的。
So did female dinosaurs of the kinds that were investigated.
它是雌性，体重近130公斤。
雌性的卵在沙漠表面下孵化。
雌性单独显示出育雏斑块。
如果雌性企鹅下蛋，所有的雄性企鹅都会筑巢。
All the male penguins will build nests if the female penguins lay eggs.
一种萤火虫的雌性学会了模仿另一种萤火虫的动作。
The female of one species of firefly has learned to imitate the moves of another.
在这些物种中，受精卵发育为雌性，未受精卵发育为雄性。
In these species, fertilized eggs develop into females and unfertilized eggs into males.
这种冷水鱼中只有雌性才能变异出独特的匹诺曹似的鼻子。
Only the females of this cold-water fish sport a distinctive Pinocchio-like snout.
在雌性毒蜘蛛“黑寡妇”的腹部可以看到有威慑作用的红点。
It's the female black widow spider that is venomous and displays a menacing red dot on her abdomen.
“狼蛛，”她说，“会抚摸雌性的腿部，以确保她能接受。”
"A tarantula," she says, "will stroke the female's legs to ensure she is receptive."
这些蜘蛛结成很大的网，雌性蜘蛛在上面用成百上千的卵悬挂茧。
These spiders spin large webs in which females suspend a cocoon with hundreds of eggs.
约一亿六千万年前，一只雌性翼龙隐翅膀受伤而坠落，葬身水底。
About 160 million years ago, a female pterosaur with an injured wing dropped from the sky into a watery grave.
这只发现于澳大利亚的小蜘蛛，会向附近的雌性炫耀其彩虹般的色彩。
The tiny arachnid, found in Australia, shows off a rainbow of colors to impress nearby females.
这种光来自雌性萤火虫乌贼，它们在春天产卵，然后死亡，被冲到岸上。
The light comes from female firefly squids, which spawn in spring, then die and wash ashore.
与博弈论直接相关的是某些具有大量过剩雌性的寄生蜂种类的性别比例。
Immediately relevant to game theory are the sex ratios in certain parasitic wasp species that have a large excess of females.
可能是雄性可以利用稀少的类胡萝卜素进行免疫防御和解毒，或者吸引雌性。
It may be that males can use scarce carotenoids either for immune defense and detoxification or for attracting females.
这一现象促使德兰格得出结论，这棵野生的贝氏海桐花可能不是真的是雌性的。
This phenomenon led De Lange to conclude that the wild Pennantia baylisiana might not truly be female after all.
对几种动物的研究表明，在选择配偶时，雌性更喜欢鲜艳的类胡萝卜素着色的雄性。
Studies of several animal species have shown that when choosing mates, females prefer males with brighter carotenoid-based coloration.
对几种动物的研究表明，在选择配偶时，雌性更喜欢鲜艳的类胡萝卜素着色的雄性。
Studies of several animal species have shown that when choosing mates, females prefer males with brighter carotenoid-based coloration.
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