Most species grow fast, mature early and are short-lived. Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed some live in the intertidal zone and others at abyssal depths. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all invertebrates. The siphon is used both for respiration and for locomotion, by expelling a jet of water. They trail their eight arms behind them as they swim. The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. Like other cephalopods, the octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the centre point of the arms (which are sometimes mistakenly called "tentacles"). Around 300 species are recognised and the order is grouped within the class Cephalopoda with squids, cuttlefish and nautiloids. The octopus is a soft-bodied, eight-armed mollusc of the order Octopoda.
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