How can you tell deep-sea octopuses apart? Check their warts

Until now, there'd been no rigorous framework for telling apart two species of deep-sea octopuses -- they're both pink and warty. A new study, though, shows that the distribution of warts is an important means of telling the two species apart -- the octopuses from the Pacific are wartier than the ones from the Atlantic. That little piece of information could be a big help in ongoing deep-sea research.

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