size from 1.2 m (4 ft) and 40 kg (90 lb) ( Maui's dolphin ), up to 9.5 m (30 ft) and 10 tonnes (9.8 LT; 11 ST) (the  orca  or killer whale). They are found worldwide, mostly in the shallower seas of the  continental shelves , and are carnivores, mostly eating  fish  and  squid