你看，成年雌鸟在产蛋的过程中会在某些长骨内产生一层海绵状的骨组织。
You see, adult female birds during egg production produce a layer of spongy bone tissue inside certain long bones.
许多雄鸟的鲜艳羽毛被认为是为吸引雌鸟而进化来的。
The bright plumage of many male birds was thought to have evolved to attract females.
像雌鸟一样，雌鸭嘴兽也下蛋。
因此，朝向东南的入口本身似乎是雌鸟偏爱的特定巢穴特征，而不是选择位置对巢穴入口电流的影响。
A southeast-facing entrance per se thus seems to be the specific nest feature preferred by females, rather than the effect of selective positioning on current at the nest entrance.
其结果是很多雌鸟无法繁殖，新生幼雏较少。
As a result many of the females can't breed, and fewer chicks are produced.
雏鸟在15日龄时已能随雌鸟上同一树夜栖。
The chicks roosted in same trees with females at 15 days after hatched.
对鸟而言，多数情况是雌鸟抛弃其伴侣和孩子。
In the case of plovers it is, more often than not, the female who abandons her mate and offspring.
雌鸟孵蛋差不多十六天，在这期间，雄鸟带回食物。
The female bird incubates the eggs for about sixteen days while the male brings food.
“雌鸟就是法官，”本兹一边打开窗帘，一边提醒我。
"The females are the judges," Benz reminds me as he opens the blind.
但是重度放牧或完全无放牧地区都导致了雌鸟比雄鸟更多。
But either heavy grazing or no grazing at all resulted in more females than males.
如果雄鸟被拒绝，它必须将巢拆掉重新造一个，以赢得雌鸟的爱情。
If spurned, the male must take the nest apart and completely rebuild it in order to win the affections of the female.
研究者认为这也许是为了减少在“不能正常发育的雌鸟”上的投入。
Researchers say this is probably to reduce investment in what they call 'inviable females.
传说雌鸟望向大海，寻找返航的水手，而雄鸟则回望利物浦，看看酒吧是否营业。
Legend has it that the female bird looks out to sea, to search for returning sailors; the male looks back towards Liverpool, to see if the pubs are open.
为了诱惑雌鸟走近并敬仰他的羽毛，他唱出了他能够表达的最复杂的歌曲。
To persuade females to come close and admire his plumes, he sings the most complex song he can manage.
有了这样健康、有支持的食物供给，雌鸟能够专心孵育幼鸟而不用去帮助雄鸟。
With this healthy, reliable food supply, females can raise the hatchlings without help from the males.
雄的一个个地在雌鸟的面前，很殷勤地用最好的姿态，来眩示它们艳丽的羽毛。
Successive males display before females with the most elaborate care, and show off in the best manner, their gorgeous plumage.
到了寒冷的季节，身体上原本鲜艳的光芒暗淡了许多，看上去和雌鸟没有分别。
The male goldfinch, easily recognized in the summer by its yellow body and black wings, loses much of its brilliance during the cold seasons when it turns light brown and looks like the female.
红隼在占巢期雌雄鸟表现出明显的巢址选择行为和领域保护行为，主要以雌鸟为主。
Male and female display obvious nest-choosing and terrain-protecting behaviors in the occupying nest period, and it is mainly male.
最近一项针对未成年雄性鸣禽的研究发现，当有雌鸟在场时，它们会突然间歌兴大发，一展歌喉。
A recent study with teenage male songbirds finds that they can suddenly have a surge of tweeting talent when they are placed in the presence of a female bird. Christie Nicholson reports.
黑头噪鸦具有储食行为，其储藏的食物对雌鸟的孵卵以及幼雏的存活可能有重要意义。
The jay shows food hoarding behavior and stored food maybe very important to nesting females as well as the survival of young.
我们挑了一只明黄色的雄鸟和一只奶白的雌鸟，给这对小鸟取名为：“阳光”和“雪球”。
Selecting a lively yellow male and a sweet white female, we named the youngsters Sunshine and Snowball.
该鸟为一夫一妻制，雌鸟担任筑巢、孵卵、育雏任务，雄鸟主要担任保卫领域及警戒任务。
The bird is monogamous, the female answers for nest building, hatching and brooding, the male answers for guarding home range and alerting.
最近的研究表明，这种鸟类的雄鸟在捕食者发出警告声音后，发起行动以引起获取雌鸟的关注。
It turns out that males get the attention of potential mates by making their move after a predator announces its presence.
因此这种鸟类建造一个家庭的投入是由负责提供窝和食物的雄类和负责生蛋的雌鸟共同分担的。
Investment in establishing a family is thus Shared between the males, who provide the accommodation, and females, who supply the eggs.
结果雌鸟在听到后者时，做出的回应很热烈，会立地寻找叫声的方向，并异样收回回应叫声。
The females became significantly more alert—looking to the sound or singing in response—after hearing the two calls together than they did if they heard just the wren.
雄鸽飞回来，会站在妻子身后，递上衔着筑巢的材料，雌鸟开始用它为她的宝宝编织成一个巢。
Then he when returns from his mission, he will stand upon his wife's back to pass the nesting material as she begins weaving them into a nest for her babies.
这两只雌鸟会各自产下一枚受过精的卵，并且随机扔掉一枚（《生物通讯》，第4卷，第323页）。
Both females will have laid a fertilised egg and randomly shunted one aside (Biology Letters, vol 4, p 323).
雌鸟与雌鸟配对在其他鸟类中并不是没有，如加利福尼亚海鸥和粉红燕鸥，但从来没有达到这么高比例。
Female-female pairings have been observed in other birds, such as California gulls and roseate terns, but never at quite such a high rate.
雌鸟与雌鸟配对在其他鸟类中并不是没有，如加利福尼亚海鸥和粉红燕鸥，但从来没有达到这么高比例。
Female-female pairings have been observed in other birds, such as California gulls and roseate terns, but never at quite such a high rate.
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