How many hearts does an octopus have?

Three divers looking at a giant Pacific octopus (Enteroctopus dofleini) in the Sea of ​​Japan. (Image credit: Alexander Semenov via Getty)

Octopuses are iconic for their eight arms. But how many hearts does one need octopus have?

It turns out that an octopus has three hearts, Kirt Onthank (opens in new tab), a squid biologist at Walla Walla University in Washington, told Live Science. The same applies to their closest relatives, octopuses and cuttlefish.

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