Cetology ( from Greek , `` kētos '' , `` whale '' ; and , '' - logia '' ) or Whalelore is the branch of marine mammal science that studies the approximately eighty species of whales , dolphins , and porpoise in the scientific order Cetacea .
Cetology is the branch of marine mammal science that studies the approximately eighty species of whales , dolphins , and porpoise in the scientific order Cetacea .