海豚先用它们的吻突将小鱼赶到大海螺壳中，然后将螺壳带出水面并晃动。

Dolphins first trap small fish in large conch shells with their rostrums (beaks). They then bring the shells to the surface and shake them.

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例如，你可能会回想起几年前的一篇期刊论文，描述了海豚是如何使用海绵来保护它们的吻突和帮助捕鱼的。

For example, you might recall the journal paper from a few years ago describing how dolphins use sponges to protect their beaks and to help with fishing.

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按照我们的分类标准，仅是本世纪的头十年，我们就发现了大约300种哺乳动物新物种——大部分是啮齿类，也有有袋类，突吻鲸类以及大量的灵长类动物。

Even within our own class, mammals, roughly 300 new species have been discovered in the first decade of this century-mostly rodents, but also marsupials, a beaked whale and a slew of primates.

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