The blue-ringed octopus is a small marine creature known for its striking blue rings that appear when it feels threatened. These octopuses are typically found in shallow waters around the Pacific and Indian Oceans. They are about the size of a golf ball and are known for their ability to change color and texture to blend in with their surroundings. Despite their small size, blue-ringed octopuses are highly venomous. Their bite can deliver a potent toxin called tetrodotoxin, which can cause paralysis and even death in humans. They are generally not aggressive and will only bite when provoked, making them fascinating yet dangerous animals in the ocean.