With his colorful appearance, the blue-ringed octopus makes a lot of people want to be pets. Octopus, everyone's first impression must be its camouflage magic. The octopus is the master of camouflage in the ocean, and it can adjust its pigmentation to match the color of its environment. In fact, besides camouflage, octopuses have many other abilities, such as poison.

The blue-ringed octopus is one of the most poisonous octopuses in the octopus family. It is listed as one of the "10 most poisonous animals in the world," along with the box jellyfish as two of the most poisonous sea creatures. The blue-ringed octopus has a sharp parrot-like beak that can easily penetrate the skin and subcutaneous muscles of an intruder. When its safety is threatened, it bites the intruder and injects venom into its body.

The venom secreted by the blue-ringed octopus contains tetrodotoxin, serotonin, acetylcholine and other substances. Tetrodotoxin is a neuroparalytic toxin that quickly paralyzes prey and is also a significant threat to humans. It is so toxic that as little as 0.5 milligrams can kill an adult. People become psychotic, unable to breathe on their own, and eventually die of respiratory failure. In addition to paralyzing the nervous system and suffocating people, the venom also prevents the blood from clotting, causing wounds to bleed profusely, which can be life-threatening. Although the blue-ringed octopus is good at poisoning, it is not good at cooking. These venoms are present in its salivary glands, but they are not caused by its own secretions, but by virus particles in the salivary glands.

Blue-ringed octopuses are very small, only about 20 centimeters. They, like other octopuses, have pigment cells in their skin and can change their body color by changing the size of the pigment cells. Blue-ringed octopuses also like to hide under coral reefs and feed on small fish and shrimp, rarely attacking other creatures. The blue-ringed octopus has grayish-brown rings on its skin that instantly turn a dazzling blue if it senses danger or irritation. Although beautiful, this is not an indication of the octopus' self-expression, but a signal that it is about to use poison and may die if it does not leave soon.