The Caribbean reef octopus (Octopus briareus) is a coral reef marine animal. It has eight long arms that vary in length and diameter. The mantle is large and chunky in comparison (up to 60 cm long). This species is difficult to describe because it changes color and texture to blend into its surroundings, using specialised skin cells known as chromatophores. Its color range is very large; it can change from crimson to green, and bumpy to smooth. It weighs around 3.3 lb or 1.5 kg. lives in hidden, rocky lairs that are difficult to locate. Their lairs are usually created in shallow warm waters. O. briareus is not a social animal, and stays at a safe distance from other octopuses of the same species, except for mating. If faced with a predator, a Caribbean reef octopus, like most other octopuses, sucks up a volume of water then expels it quickly in the form of a jet to propel itself away. To further deter predators, it can eject ink to mask its escape. This octopus does not live in its lair for its entire life; instead, it moves often except when caring for eggs or young.