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.
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.
“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.
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.
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.
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.
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.
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.
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.
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.
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.
他打开先前收起的橙黄色羽冠，斜张着翅膀，像一道闪电向雌鸟冲去，然后迅速撤回，把自己藏了起来。
He unfurls his previously hidden carrot-orange crest and streaks out at her, wings askew, then darts back to hide again.
为了将温度的重要性孤立来看，他们只研究雌鸟的喙长，并将生活在不同气候但拥有相似食性的鸟类进行对比。
They isolated the importance of temperature by studying only female beak length and comparing species with similar diets living in different climates.
雄鸟不会帮助雌鸟建巢、孵卵或哺育雏鸟——它们能够奉献的只有基因而已，因此，雌鸟在选择雄鸟时格外挑剔。
Males don't help the female build a nest, incubate the eggs, or raise the chicks-all they give her are their genes. The females are thus very choosy about which male they pick.
泰瓦罗瓦角是世界上唯一一处信天翁大陆繁殖基地，据称，在过去的70年里该地仅发生过两起雌鸟共同筑巢的先例。
Taiaroa Head - the only mainland albatross breeding colony in the world - has recorded only two previous instances of females setting up a nest together in the past 70 years.
据牛津大学的研究报道，一旦雄鸟开始鸣唱，它的伴侣雌鸟也开始唱歌，却是为了干扰雄鸟的歌声，以此破坏任何对第三者示好的乐音。
Once the male starts warbling, his partner launches into a song that interferes with his-a clear attempt, the researchers say, to ruin any overture to the unattached female.
据牛津大学的研究报道，一旦雄鸟开始鸣唱，它的伴侣雌鸟也开始唱歌，却是为了干扰雄鸟的歌声，以此破坏任何对第三者示好的乐音。
Once the male starts warbling, his partner launches into a song that interferes with his-a clear attempt, the researchers say, to ruin any overture to the unattached female.
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