Subtle variations in sperm-whale calls suggest that individuals announce themselves with discrete personal identifier. To put it another way, they might have names.
The longer I'm on this planet the more I realise that we, as humans, are extremely arrogant in terms of our belief of being the end-all-and-be-all of creation.
To be honest, I rather liked Douglas Adams' view better, with humans as the third-most-intelligent species on Earth. Although I'm afraid the sperm whale does not fare as well as the dolphins or mice in his books. ;)
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