See how the blue-ringed octopus warns predators away—and paralyzes prey. | National Geographic

As their name suggests, blue-ringed octopuses have iridescent blue rings on their skin. These rings typically appear when the octopus feels threatened or agitated. When at rest, they often display a more muted coloration. Despite their small size, blue-ringed octopuses are considered one of the most venomous creatures in the ocean. Their venom contains tetrodotoxin, a potent neurotoxin that can be fatal to humans. 📍 Dauin, Philippines . . . #ocean #octopus #bbc | Critter Hunter

Blue-Ringed Octopus | Secrets Of The Octopus

Although only 8-10 inches long, the blue-ringed octopus is one of the most venomous animals on the planet. Their bright blue rings act as a warning to potential predators. Learn more in our Marine Life Encyclopedia: https://bit.ly/39oZhQG | Oceana

It's cute, but the blue-ringed octopus is one of the most dangerous animals in the ocean, with venom a thousand times more poisonous than cyanide. 📷: instagram.com/mekaialyo | OceanX