The Fascinating Biology of Octopuses

Did you know that octopuses have three hearts? Two of them pump blood to the gills,

while the third pumps it to the rest of the body. And here’s the strange part:

When an octopus swims, its main heart stops beating. That’s why octopuses

prefer crawling instead of swimming — it literally exhausts them. Octopuses also have

blue blood, because it’s based on copper instead of iron. This helps them

survive in cold, deep oceans. Even crazier: About two-thirds of an octopus’s

neurons are located in its arms. That means each arm can think and react on its own.

The ocean is smarter than we think.