Seals belong to a group of animals called this, Latin for "fin-footed"
Image from page 539 of "The 
animal kingdom, arranged after its organization : forming  Image from page 24 of
... [DOC] [TLE] Whale Watch Capital of the World - Seals & Otters [PAR] The term pinniped is from the Latin pinna, for fin, wing, or feather and pedis for 
foot giving them the designation fin-footed animal.