This guide provides an in-depth exploration of the fascinating underwater world of the octopus. Learn about the anatomy, behavior, and habitat of these mysterious creatures, as well as tips for observing them in their natural environment. Discover the unique adaptations that allow
An octopus is a soft-bodied, eight-limbed mollusc of the order Octopoda. The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids. Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a beaked mouth at the centre point of the eight limbs. An octopus can radically deform its shape, enabling it to squeeze through small gaps. They trail their appendages behind them as they swim backwards. The siphon is used for respiration and locomotion. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse invertebrates.