- aquatic mammal - whales and dolphins; manatees and dugongs; walruses; seals
--1 is a kind of placental, placental mammal, eutherian, eutherian mammal
--1 has part: flipper
--1 has particulars:cetacean, cetacean mammal, blower; sea cow, sirenian mammal, sirenian; pinniped mammal, pinniped, pinnatiped