这种鸟雄性比雌性更加色彩艳丽。
这一物种的雄性有一条白色的尾巴。
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。
雄性信天翁参与孵卵。
他们想让这些雄性动物和野生的雌性动物交配。
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.
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.
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.
雄性雷射鸟在求爱时会同时利用这两种信号模式。
The male riflebird exploits both of these modes of signaling simultaneously in his courtship display.
有趣的是，它们也表现出一贯的雄性在巢中育儿的模式。
Interestingly, they also show a consistent pattern of nest care by the male.
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.
最可能遭受黑寡妇叮咬危险地动物当属昆虫以及雄性黑寡妇。
The animals most at risk from the black widow's bite are insects and male black widow spiders.
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.
这微小的联系可能已经足够让别的种群的雄性收到群新旋律了。
This minimal contact could be enough for males from another group to the new melody.
巢里的那些恐龙可能是成年雄性，不会需要用来制造蛋壳的钙。
Those dinosaurs on the nests were probably adult males who wouldn't have needed calcium for making eggshells.
雌性鸟类与雄性鸟类有相同的图案，但是雌性鸟类的颜色更暗淡一点。
The female birds have the same pattern as the males, but they are a little duller in color．
像许多其他雄性脊椎动物一样，如有可能，它们会拥有不止一个配偶。
Like males of most other vertebrate species, these animals take more than one mate if they can.
在一项实验中，雄性草原田鼠服用了一种抑制抗利尿激素作用的药物。
In an experiment, male prairie voles were given a drug that suppresses the effect of vasopressin.
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.
雄性鹿角蝇也做同样的事情，只不过它们用鹿角互相头撞头——以赶走竞争对手。
Male antler flies do the same, except they use their antlers to head-butt each other—to see off rivals.
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.
在第一种情况下，雄性竞争和性内选择产生相对简短的鸣声，主要用于地盘行为。
In the first, male competition and intrasexual selection produce relatively short, simple songs used mainly in territorial behavior.
十年后的另一项研究报告称，成年雄性白尾鹿在即将发情和发情期间会摩擦前额。
A decade later another study reported that adult male white-tailed deer exhibited forehead rubbing just before and during the rut.
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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