Other features, however, show experts that Pakicetus is a transitional form between a group of extinct flesh-eating mammals, the mesonychids, and cetaceans.

然而，专家认为巴基鲸是已经灭绝的食肉哺乳动物中爪类和鲸类之间的过渡物种。

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Mercury levels at more than two-thirds of the sites exceeded what scientists believe fish-eating mammals, such as mink and otters, should ingest.

三分之二选本中汞含量超过了科学家们认为水貂、水獭等以鱼为食的哺乳动物可摄入的含量。

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The giant animals are estimated to have released, along with other large plant-eating mammals, around 9.6 million tonnes of the powerful greenhouse gas each year - more than 13, 000 years ago.

据估计，一万三千年前，巨大的长毛象和其他的食草动物每年释放出960万吨强大的温室气体。

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Another early result from these experiments, according to Professor Trites, is that these mammals are suffering because they may be eating the wrong kind of food.

BBC: Sea lion test to probe declines

Their results indicate that all placental mammals arose from a small, furry, insect-eating animal.

BBC: Earliest placental mammal ancestor pinpointed