我们在研究中发现，在繁殖方面，严寒会削弱雄性的交配表现。
In studies, we found that when it comes to reproduction, freezing diminishes the mating performance of males.
当把雌性牛鹂单独养在隔音的房间里，让它们听到雄性的歌声，它们就会表现出交配行为。
When female cowbirds raised in isolation in sound-proof chambers were exposed to recordings of male song, they responded by exhibiting mating behavior.
一些学者指出，大象和长颈鹿都不会摆动它们又长又粗的尾巴来阻止雄性的靠近。
Some point out that neither elephants nor giraffes sport long, thick tails to obstruct male access.
甚至有可能雄性的三只脚搭在雌性的身上，然后用尾巴裹住雌性的尾巴。
The male may even have rested three legs on the female and wrapped his tail under hers.
这项研究第一次证明了野生动物对待某一件物品时，雌性和雄性的反应是不同的。
The study presents the first evidence of an animal species in the wild in which object play differs between males and females.
之后，他们就加入全是雄性的象群，想必就是在这个时候他们从成年雄象那里学习生存之道。
They then join all-male groups, and presumably learn from mature males the recipe for a successful life.
雄性的鹿角蝇所做的也和突眼蝇一样，只是他们用的是鹿角而不是眼柄来进行搏斗，以赶跑对手。
Male antler flies do the same, except they use their antlers to head-butt each other – to see off rivals.
雄性的招潮蟹会挥舞着它那只大钳子来炫耀自己，蜂鸟则是通过和配偶一起俯冲飞翔来展现他的雄姿。
Male fiddler crabs wave an outsized claw to show off, and male hummingbirds display their flying prowess with a flamboyant mating dive.
在各种灵长类和非灵长类的生物中，某个物种一夫多妻的程度跟它们雄性的体格比雌性大的程度密切相关。
Among primate and nonprimate species, the degree of polygyny highly correlates with the degree to which males of a species are larger than females.
喙的颜色可以用来区分翠鸟的性别：雄性的喙大部分是黑色，而雌性的下颌是橙色的，正好同它的脚相配。
Beak color gives away a kingfisher's gender: males show mostly black, while females have an orange lower mandible that matches their feet.
河口海岸与海洋科学研究所的Grant Glimore说雄性的鱼儿可能用其中一些声音来向雌性求爱。
Grant Gilmore of Estuarine Coastal and Ocean Science Inc. says that male fish probably use some of these sounds to woo females.
他们仅仅通过年长雌性更有可能生出雄性的子代，就确确实实的证明了随着雌性年龄的增加他们的繁殖风险也随之增加。
What they do prove is that the reproductive risk to a female increases as she gets older, merely because she is more likely to give birth to a male.
研究人员用立体声系统对着雌泡蟾和食蛙蝙蝠播放了不同的雄性的鸣音，观察它们最先接近哪一种鸣叫的来源。
The researchers played different túngara frog songs to female frogs and frog-eating bats on a stereo in order to see which speaker they approached first.
还有一个发明是纳森•梅尔沃德的最爱——激光灭蚊器，该灭蚊器能够区分蚊子的性别，因为雄性的蚊子不会携带疟疾传播，但雌性的蚊子会。
And then there's Myhrvold's favorite -- a laser mosquito zapper that can tell the difference between males, which aren't carriers of malaria, and females, which are.
世界上最后一只雄性的纯种哥伦比亚盆地侏儒兔最近不幸死亡。这致使美国在实施一个旨在试图拯救这种濒危物种免于灭绝的圈养繁殖计划的过程中，仅有两只纯种的雌性侏儒兔尚存。
The last male purebred Columbia Basin pygmy rabbit has died, leaving just two females in a captive breeding program created to try to save the endangered species from extinction.
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.
雄性动物热情地守护它们的交配对象。
这一物种的雄性有一条白色的尾巴。
雄性动物的求偶有点大肆声张的，他们要大力炫耀自己。
Courtship is somewhat vocal with a lot of displaying by the male.
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.
这对姐妹，加上另一只叫泰迪的雄性负鼠，经由丹麦的一家动物园抵达这里，并将于7月1日首次公开亮相。
The sisters, plus a third male opossum called Teddy, arrived via a zoo in Denmark, and will make their public debut on July 1.
只有当母老虎在保护自己的幼崽时，或者当公虎在保护母老虎不受其他雄性动物的注意时，它们才会殊死搏斗。
Tigers fight to death only when a tigress is defending her young, or when a tiger is guarding a tigress from the attentions of other males.
他试图教一只叫巴斯的雄性海豚和一只叫桃瑞丝的雌性海豚隔着一道坚固的屏障互相交流。
What he tried to do was to teach a male dolphin called Bass and a female called Doris to communicate with each other across a solid barrier.
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