Watch: Octopuses Punch Fish, Sometimes For No Apparent Reason : NPR

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What have eight legs, hunt among a group of fish and can throw a mean sucker punch?
According to research published in Ecology last week, the answer would be octopuses (yes, octopuses, not octopi—we asked).
Octopuses punch fish. Deliberately. Sometimes there's a reason, but other times, there's no discernible excuse. Researchers caught this behavior on video.
The first time researcher Eduardo Sampaio witnessed this phenomenon, he laughed. Normally that'd be fine but at the time he was underwater wearing scuba equipment.

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