The reptiles were once on top of the world.

爬行动物曾经位居食物链顶端。

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Several species of birds, reptiles and animals exist here that cannot exist elsewhere in the known world.

鸟类，爬行动物和动物物种存在的若干这里不能存在于已知世界其他地方。

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The Chinese alligator is one of the most endangered reptiles in the world.

扬子鳄是世界上最危险的爬行动物之一。

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The study hinges on the analysis of existing fossils found in western North America, from Canada through to the south-west of the US, where the fossils of small reptiles are much better preserved than in other parts of the world.

BBC: Obama-named lizard was wiped out with the dinosaurs