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.
雄鸟喙呈红色，有别于雌鸟。
The male bird is distinguished from the female by its red beak.
雌鸟伏在蛋上直到其孵化。
雄鸟黄色的喙是与雌鸟相区别的主要特征。
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.
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.
唐纳德与雌鸟开始玩起捉迷藏的游戏。
雄鸟在雌鸟面前趾高气扬地走着。
那种鸟雄鸟的喙呈橙色，与雌鸟不同。
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.
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.
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.
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.
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.
在鸟的繁殖期快要结束的时候，雌鸟离婚的比率就下降了。
Towards the end of the plover breeding season, the rate of female divorce declines.
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.
在千鸟的繁殖期快要结束的时候，雌鸟离婚的比率就下降了。
Towards the end of the plover breeding season, the rate of female divorce declines.
好样的！唐纳德成功地引来一只雌鸟，现在，他需要想办法留住她！
OK, Donald can pull down a Mary. Now he needs to make her stay.
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.
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.
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