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 ...

More than just aquarium must-sees, octopuses are known for being highly intelligent creatures and, at times, even friends to humans. These connections are the subjects of the popular 2020 documentary ...

How do fish breathe underwater and the differences between gills and lungs. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Like humans, fish ...