鲨鱼会捕食人类吗？
Despite their scary reputation, sharks very rarely attack humans. They would much rather eat fish and marine mammals.
Of the more than 300 species of sharks, only about a dozen have ever been involved in attacks on people. Sharks evolved millions of years before humans existed, so humans are not part of their normal diet. Sharks will eat whatever is available, but most feed mainly on smaller fish and invertebrates. Some of the larger species hunt seals, sea lions and other marine mammals.
Sharks sometimes attack humans when they are confused or curious. If a shark sees a person splashing in the water, it may come closer to investigate, which can lead to an accidental bite.
In fact, sharks have much more to fear from us than we do from them. People hunt sharks for their meat, organs, skin and fins, which are used to make products such as shark fin soup, oils and leather. Sharks play an important role in ocean ecosystems, but overfishing is threatening some shark populations. Scientists are studying where sharks live, how they migrate and how their numbers are changing, to find the best ways to protect them.
鲨鱼虽然名声吓人，却很少攻击人类。它们更喜欢吃鱼和海洋哺乳动物。
在 300 多种鲨鱼中，只有大约十几种曾经攻击过人。鲨鱼在人类出现之前几百万年就已经进化出来了，所以人类并不在它们的日常食谱上。鲨鱼有什么吃什么，但大多数鲨鱼主要吃小鱼和无脊椎动物。一些体型较大的鲨鱼会捕食海豹、海狮和其他海洋哺乳动物。
鲨鱼有时会在困惑或好奇的时候攻击人类。如果鲨鱼看见有人在水里扑腾，它可能会游过来看个究竟，结果意外咬伤人。
其实，比起我们怕鲨鱼，鲨鱼更该怕我们。人类捕杀鲨鱼，是为了它们的肉、内脏、皮和鳍，用来做鱼翅汤、油和皮革等产品。鲨鱼在海洋生态系统中扮演着重要的角色，但过度捕捞正在威胁一些鲨鱼种群。科学家正在研究鲨鱼生活在哪里、怎样迁徙、数量如何变化，以便找到保护它们的最好办法。