A blue-ringed octopus has bright blue ring patterning on its body that it flashes to warn off predators. It also has a very poisonous venom.
Molluscs: Blue-Ringed Octopus Warning Coloration
Next Generation Science Standards for this Video
The venomous Blue ringed octopus has an elaborate nervous system connected to chromatophores that can change the skin’s color. To warn predators to stay away, it flashes a bright color pattern in its skin.