像恐鸟、雷鸟和象鸟这样已经灭绝的鸟类都留下了它们的蛋壳化石。
Big extinct birds such as the giant moa, thunderbirds and elephant birds all left eggshells behind them.
于是他和他的同事对那些已经灭绝的鸟类羽毛的化石做了显微观察。
He and his colleagues made a microscopic inspection of fossils of feathers from extinct birds.
同时他还提醒道，许多其他被认为已经灭绝的鸟类，只是在等待人们的再次发现。
He cautions that other birds have been assumed to be extinct, only to be rediscovered later.
他们宣称，始祖鸟不是爬行动物和鸟类之间的那一节链条——只是一种已经灭绝的，具有爬行动物特征的鸟类而已。
They argue thatArchaeopteryx is not a missing link between reptiles and birds — it isjust an extinct bird with reptilian features.
经过数代的进化(退化)，这些鸟类已经不再会飞翔，很多鸟类因为再次出现了天敌却无力逃生或对抗而灭绝。
After several generations of evolution (degradation), these birds can not know many birds fly, because once again appeared predators but unable to escape or against extinction.
由伍兹·霍尔海洋研究所的安德鲁·索洛带领的研究小组则从一种不同的统计方法入手，但得出结论仍然是这种鸟类已经几近灭绝。
Another group, led by Andrew Solow of Woods Hole Oceanographic Institution, used a different statistical approach, but also concluded that the bird is likely to be extinct.
大部分恐龙已经灭绝，但是恐龙的后代——鸟类存活下来，并繁衍至今。
Most dinosaurs have become extinct, but the descendants of dinosaurs - birds, survive and reproduce so far.
所以我们在世界上的独特地位来自于鸟类的大量繁殖，虽然许多种类已经灭绝了，但幸运的是，出于尊重我们成功地保留下几个种类。
So what makes us unique in the world is this very wide proliferation of birds, species which we've lost but fortunately because of the honors we've managed to hang on to a few.
所以我们在世界上的独特地位来自于鸟类的大量繁殖，虽然许多种类已经灭绝了，但幸运的是，出于尊重我们成功地保留下几个种类。
So what makes us unique in the world is this very wide proliferation of birds, species which we've lost but fortunately because of the honors we've managed to hang on to a few.
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