Aspect: Constantly and abrubptly changes the colour of its mottled coat when approached, with a combination of brown, blue, green and turquoise, but when at rest tries to blend in its background. Population: Common, but only seen at night. Notable feature: A sure way of distinguishing Octopus birareus from the more common, but larger, Octopus Vulgaris is the total absence of darker rings around its tentacle suckers. Environment: Never seen in daytime. Creeps out of its recess to hunt. It is a great bivalve, crustacean and gastropod predator in particular. Behaviour: Very wary.
