Like fish they are equipped with highly developed eyes and other sense organs, include both active swimmers and bottom-dwellers, and in many cases have a streamlined body for more efficent locomation.
Swimming is by rapidly expelling water from the mantle cavity.
The funnel is highly maneouverable and can be directed in any direction, allowing motion backwards or forwards. All cephalopoda are carnivorous, feeding primarily on fish , other molluscs, crustacea , and worms. The head projects into a crown of prehensile tentacles - ranging from 8 in the octopus to 80 or 90 in the living nautilus. These tentacles are actually a specialised form of the standard molluscan foot, and used for grasping prey. Once the prey is snared it is bitten with strong beak-like jaws and pulled into the mouth by the radula.