Except for the whole murdering for fun thing, dolphins are awesome. They may even call to each other using different whistles for different individuals - that is, names. (Well, it's not a whistle, it's a vibrating membrane. Ew!)
Each individual has an identifying whistle, which his friends copy, though they repeat it a bit differently, which suggests they're not just mimicking. In fact, pairs only use each other's whistle when they've become separated. Neat!
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