1) Aquatic mammal 2) Pinniped 3) Pinniped mammal 1) Phocine 2) Pinniped 3) Seahorse 4) Walrus 
• (n.) Any bird which has the toes bordered by membranes. • (a.) Having the toes bordered by membranes; fin-footed, as certain birds.
Pin·nat'i·ped adjective [ Latin pinnatus feathered + pes , pedis foot: confer French pinnatipède .] (Zoology) Having the toes bordered by membranes; fin-footed, as certain birds. 
pinnatiped Having lobed toes, as certain birds.