Three divers looking at a Giant Pacific Octopus (Enteroctopus dofleini) in the Sea of Japan. Octopuses are iconic for their eight arms. But how many hearts does an octopus have? It turns out that an ...
With blue blood and three hearts, the octopus has one of the most unusual circulatory systems in the animal kingdom.
Results that may be inaccessible to you are currently showing.
Hide inaccessible results
Feedback