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.
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