When it’s fully grown, this Caribbean pygmy octopus will be just the size of a silver dollar. As a hatchling, it’s dwarfed by a penny. The Aquarium at Mote Marine Laboratory in Sarasota, Florida, ...

Wait, I thought every day was octopus day. Oh well. An eight-armed hug for everyone! My favorite species is the Giant Pacific Octopus. Learn more about them in this video from the National Aquarium.

The blue ring octopus is a small animal with a lethal secret. Though small, this poisonous creature carries a powerful toxin that can kill a human being within minutes. What is even more frightening ...