Did you know that baby dolphins name themselves when they're just a few months old? To identify themselves, little dolphins use a blend of whistles, chirps, and squeaks. Each name is unique.
Wow! What's more, scientists have found that dolphin whistles are influenced by where they live and how many other dolphins they hang out with. The whistles of dolphins that live in areas with a lot of seagrass are higher pitched and shorter. When they're in muddy water, dolphins' names sound lower and last longer. It is believed that dolphins are the only animals in the animal kingdom that give themselves unique names.
孩子们，你们知道吗，几个月大的宝宝海豚会给自己起名字！为了让自己的名字听起来独一无二，小海豚们给自己取名字的时候会使用口哨声、鸣叫声和尖叫声。因此，每个海豚的名字都是独一无二的。
这也太神奇了吧。科学家们还发现，海豚的口哨声会受到它们栖息地以及它们海豚族群的影响。比如说，如果生活海域有大量海草，那么海豚的口哨音调会较高而且较短。如果当它们生活在比较浑浊的水域时，海豚的名字听起来会更接近低音，而且持续时间更长。科学家们认为海豚是唯一给自己起名字的动物。