This is the moment a diver had a bizarre encounter during octopus mating season in the waters of Tulamben, Bali. In footage ...

Add in the octopus’s small size (generally around eight inches), relatively short arms, bell-shaped body, pale coloring, and tendency to hover over the seafloor, and you’ve got a cephalopod ...

Now, researchers studying the octopuses have learned that not only do male blue-lined octopuses use their venom against enemies, but also against members of their own species — cannibalistic females.

Phoebe Waller-Bridge will narrate and executive produce 'Octopus!,' a two-part nature documentary for Amazon Prime Video.