雄性动物热情地守护它们的交配对象。
这可以使这一对正常交配同时也阻止雌禽待在窝里。
This allows the pair to mate properly and stops the hen from staying in the nest.
它想交配，但它也害怕，想逃跑。
It wants to mate but it's also afraid and wants to run away.
这些神灵降临凡间，并与女性人类交配。
These divine beings descend to earth and mate with female humans.
这只鸟意识到，它可以进食、休息，然后交配。
玩耍还可以为求爱和交配所需的社会行为提供练习。
Play can also provide practice in social behaviors needed for courtship and mating.
对它们来说，它们聚集在一起交配，然后分道扬镳。
For them, they come together to mate, and then they go their separate ways.
现在，当它们从冬眠中醒来时，交配的过程就开始了。
Now when they emerge in the spring from hibernation, the mating process begins.
如果雄蛙能够设法不经历这样的冻结周期就更可能交配成功。
If the male frog could manage not to go through this freezing cycle, he'd probably have more success in mating.
他们的研究对象是草原田鼠，一种终生交配的小型啮齿动物。
Their study was conducted in the prairie vole, a small rodent that mates for life.
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.
下雨时，成年企鹅们会出现并聚集在临时出现的水塘里进行交配。
When it rains, the adults emerge and congregate to mate at temporary ponds.
此外，左旋和右旋蜗牛可能无法交配，因为它们的扭曲方向不相容。
In addition, perhaps left and right-handed snails cannot mate with each other, having incompatible twist directions.
教授，难道动物梳毛不可能是因为它们在争斗或交配中弄得一团糟吗？
Professor, isn't it possible that animals groom because they've got messed up a little from fighting or mating?
基因流动是相对自由的，因为个体可以移动，然后在新的地方与个体交配。
Gene flow is relatively free because individuals can move and then mate with individuals in their new location.
它们确实会接触到雌性美洲鳄，然后雌性美洲鳄会去寻找雄性美洲鳄并与其交配。
They do reach the female alligator, who then goes to find and mate with the male.
根据这一定义，区分不同物种的标准是不同物种的个体间相互交配产生可育后代的可能性。
According to this definition, one species is distinguished from another by the possibility of matings between individuals from each species to produce fertile offspring.
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.
基因流动，即等位基因在整个物种范围内的移动，是相对自由的，因为个体可以移动，然后在新的地点与个体交配。
Gene flow, the movement of alleles across the range of the species, is relatively free because individuals can move and then mate with individuals in their new location.
汉密尔顿指出，黄蜂卵在寄主即另一种昆虫的幼虫内发育，新出现的成年黄蜂立即交配并四散，这提供了一个非常有说服力的分析。
Hamilton, noting that the eggs develop within their host—the larva of another insect—and that the newly emerged adult wasps mate immediately and disperse, offered a remarkably cogent analysis.
很多动物只在一年的某个时候交配繁殖。
骡子是公驴和母马交配而生的杂种动物。
鲸用二十四小时来交配。
他们想让这些雄性动物和野生的雌性动物交配。
乌鸫交配时会保护自己的地盘，不允许外来者侵入。
Mating blackbirds will defend their territory against intruders.
雌性与一雄性配对时，雌性不允许其他雄性与其交配。
During the time she is paired to a male, the female allows no other males to copulate with her.
一只名叫马里阿的雌性美洲虎与一只来自巴西的雄性美洲虎交配。
通过这种方式，它们表明了自己的攻击性或交配意愿。
By this means, they signal their level of aggression or readiness to mate.
通过这种方式，它们表明了自己的攻击性或交配意愿。
By this means, they signal their level of aggression or readiness to mate.
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