These cephalopods are bros, man.

Octopuses are intelligent creatures, capable of learning from experience, maintaining short- and long-term memory, and even using tools such as coconuts for personal fortresses.

One of them was even able to predict World Cup results with uncanny accuracy.

Now comes the biggest proof that octopuses -- not "octopi" -- are truly intelligent creatures: They know how to high-five.

At least two cephalopods off the coast of Portugal can do so.

A diver managed to film the stunning sea encounter on June 1 of two octopuses engaging in the universal act of bromanship.

No word on whether they went to a sports bar afterwards, but you can hear the diver giggling.

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