[356/366] active displacement

Today I learned that octopuses punch fish, scientists aren't sure why but are willing to speculate that it might be out of spite.

The story is full of gems.

In fact, this antisocial fish-punching phenomenon – which scientists term "active displacement" of fish – occurs in the midst of collaborative hunting efforts, in which octopuses and fish team up to chase and trap prey together.
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In much the same way as you or I might try to elbow-out fellow diners at a buffet, this 'partner control mechanism' therefore seeks to establish a sense of control and dominance in a food free-for-all. It's just that partner control – when delivered by an octopus – is a tad more brutal than your average buffet queue experience.

"To this end, the octopus performs a swift, explosive motion with one arm directed at a specific fish partner, which we refer to as punching," the researchers explain in a new paper.

"From an ecological perspective, actively punching a fish partner entails a small energetic cost for the actor (i.e. octopus), and simultaneously imposes a cost on the targeted fish partner.
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"While we can't yet know for sure why octopuses are randomly punching fish like this, at least one of the theoretical explanations given suggests octopuses may have some serious attitude.