Sea mammal

Mammals that live in the sea: whales and dolphins (phylum Chordata, class Mammalia, order Cetacea), seals (phylum Chordata, class Mammalia, order Pinnipedia), and sea cows (phylum Chordata, class Mammalia, order Sirenia).

• What general words refer to sea mammals?
  cetacean pinniped
• What species of whales and dolphins are there?
  whale sperm whale killer whale blue whale right whale dolphin porpoise
• What species of seals are there?
  seal walrus sea lion
• What species of sea cow are there?
  sea cow manatee