Add Yahoo as a preferred source to see more of our stories on Google. Getty Images / Mauricio Handler In the new Prime documentary series “Octopus!” actress Phoebe Waller-Bridge spends an hour and a ...

Just like vertebrates, cephalopods — such as octopuses and squid — have elaborate brains. Neuroscientists are flocking to them for insights into how intelligence evolved.

With three hearts, blue blood, and the ability to squeeze through a space the size of their eyeballs, octopuses are said to be like aliens on Earth. The new National Geographic docuseries, "Secrets of ...