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Fish Use Sign Language While Hunting Prey, Study Suggests

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Fish might have more going on in their fishy brains than thought, a new study suggests. Researchers found that at least two types -- groupers and coral trout -- use what amounts to sign language to help their hunting partners, reports LiveScience.

The finding plays off another unusual trait: Both fish are known to team up with other creatures, coral trout with octupuses and groupers with moray eels, to hunt prey.

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