placental mammal vs aquatic mammal

Other hyponyms of placental mammal include farm animal, livestock, stock, bull, cow, yearling, buck, doe, insectivore, carnivore, Fissipedia, aardvark, ant bear, anteater, Orycteropus afer, bat, chiropteran, gnawing mammal, lagomorph, gnawer, rodent, Ungulata, hoofed mammal, ungulate, Unguiculata, unguiculate, unguiculate mammal, coney, cony, das, dassie, hyrax, pachyderm, edentate, anteater, pangolin, scaly anteater, primate, tree shrew, colugo, flying cat, flying lemur, proboscidean, proboscidian, plantigrade, plantigrade mammal, digitigrade, digitigrade mammal.