雄鸟和雌鸟轮流伏窝。
The male and female birds take turns in sitting on the eggs.
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.
雌鸟伏在蛋上直到其孵化。
雄鸟喙呈红色，有别于雌鸟。
The male bird is distinguished from the female by its red beak.
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.
雄鸟黄色的喙是与雌鸟相区别的主要特征。
雄鸟在雌鸟面前趾高气扬地走着。
他们还看见雌鸟到处飞，向她的伴侣哭诉。
They saw the mother robin flying about, and crying to her mate.
他们还看见雌鸟到处飞，向她的伴侣哭诉。
They saw the mother robin flyingabout, and crying to her mate.
那种鸟雄鸟的喙呈橙色，与雌鸟不同。
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.
图中雄鸟正在传递一只野鼠给右侧的雌鸟。
The male in this image is passing a vole to the female on the right.
雄鸟雌鸟都会叫唤，但通常只有雄鸟才唱歌。
While both male and fe male songbirds can call, usually only the male sings.
“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.
然后，他箭一般地跑到塔楼的后面，从另一侧跳向雌鸟。
Then he races behind his tower and jumps at her from the other side.
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.
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.
很多种类的雌鸟都是根据雄鸟唱歌唱得怎么样来选伴侣的。
Female birds in many species choose a partner based on the way they sing.
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.
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.
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