Biologists have long debated about whether egg production in birds is biologically highly costly, some theorizing that egg production is energetically or nutritionally demanding.
长期以来，生物学家一直在争论鸟类的产蛋在生物学上是否具有很高的成本，有的理论认为产蛋对能量或营养的要求很高。
You see, adult female birds during egg production produce a layer of spongy bone tissue inside certain long bones.
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。
As we've discussed, birds are apparently descendants of dinosaurs and shared many commonalities with some dinosaur species, like feathers and maybe even flight and of course egg laid.
正如我们讨论过的，鸟类显然是恐龙的后代，与一些恐龙物种有许多共同之处，比如羽毛，甚至飞行，当然还有产卵。
We have not only seen an earlier break up of ice on rivers and melting glaciers, but also the early emergence of insects, egg laying by birds and the flowering of plants.
克拉克说，“我们不仅看到了冰河提前开冻，冰山融化，而且看到提前出现的昆虫、提前下蛋的鸟类和提前开花的植物。
Commercial egg and meat birds have high requirements for protein and energy and do not tolerate high fibre levels in their diets.
商业蛋禽和肉禽对蛋白质和能量的需求很高，并且不能接受高纤维饲料。
Is the first bird or egg, you do not know, I do not know, only the birds know.
是先有鸟还是先有蛋，你不知道，我不知道，只有鸟知道。
Mature breeding birds are very expensive - even a fertilised ostrich egg isn't cheap so you need quite a bit of capital to begin with.
周到的养殖鸟类非常昂贵，甚至繁殖鸵鸟蛋不便宜，所以你需要许多资金才能开始。
A bird or the egg first, before disappearing disappear, you know, I know, only the birds do not know.
是鸟先消失还是蛋先消失，你知道，我知道，只有鸟不知道。
Is it a bird that goes away or an egg disappears, you know, I know, only birds don't know.
是鸟先消失还是蛋先消失，你知道，我知道，只有鸟不知道。
The birds laid the first, third and fourth eggs in the seed box so they didn't break. It would be good if the second egg didn't break!
鸟是在食物盒里下的第一，第三和第四个蛋所以它们没有被打破。要是第二个蛋没裂就好了！
They are also rumored to be egg snatchers, stealing eggs from the nests of other birds to eat.
也有传言说它们是鸟蛋抢掠者。它们从其他鸟的鸟巢偷鸟蛋来当食物。
The eagle 's egg hatched along with the other eggs in the prairie chicken' s nest, and the little eaglet grew up with the other baby birds.
这只鹰蛋和其他许多松鸡蛋一起在松鸡窝里被孵化出来，小鹰和松鸡们一起长大了。
The eagle's egg hatched along with the other eggs in the prairie chicken's nest, and the little eaglet grew up with the other baby birds.
这只鹰蛋和其他许多松鸡蛋一起在松鸡窝里被孵化出来，小鹰和小松鸡们一起长大了。
Some of us keepers and breeders will be thinking that we have no problems because our birds have access to cuttlebone or they get oyster shell grit or crushed egg shells or chicken bones.
我们中的一些人员和育种会认为我们没有问题，因为我们只获得海螵蛸或他们得到牡蛎壳砂砾或压碎蛋壳或鸡骨头。
Today I spotted one of the birds sitting on the eggs, so I wondered if they had laid another egg, and they did!
今天下午，我发现小鸟在孵蛋，觉得鸟可能又下蛋了，果然就多出来了一个蛋！
Britain's rarest breeding birds are under threat from fanatical and selfish egg collectors.
英国最珍贵的种鸟正因为那些狂热而自私的鸟蛋收集者而面临着威胁。
The next day when Mum was cleaning the bird cage, she spotted that the birds laid another egg. But it broke.
第二天妈妈打扫鸟笼子的时候，她又发现了一个蛋，可是蛋已经裂了。
But by the time the egg just got, I feel sad for the birds and then I cried and asked my brother to put the egg back.
可是等方才掏到蛋地时分，本人去为鸟儿们感应悲伤，然后本人就哭着叫哥哥把蛋放归去。
My beak is unlike other birds whose are sharp , and mine is flat. After I broke the egg and went out by the skin of my teeth, I was tired to death.
由于我的嘴喙不像大部分的鸟是尖的，我的是平的，因此当我好不容易破蛋而出以后，我差点没累死！
Here also is the Chinese biggest base of the egg birds and beasts breeds. The land all USES the farm manure, therefore corn feeling in the mouth has meat thick, lubrication.
这里又是中国较大的蛋禽养殖基地，土地都使用农家肥，因此玉米口感肉厚、滑润。
Here also is the Chinese biggest base of the egg birds and beasts breeds. The land all USES the farm manure, therefore corn feeling in the mouth has meat thick, lubrication.
这里又是中国较大的蛋禽养殖基地，土地都使用农家肥，因此玉米口感肉厚、滑润。
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