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How to sign: mammals having a placenta; all mammals except monotremes and marsupials
Similiar / Same: placental, placental mammal, eutherian
Within this category: aardvark, aquatic mammal, bat, buck, bull, carnivore, cow, digitigrade mammal, doe, edentate, Fissipedia, flying lemur, hyrax, insectivore, lagomorph, livestock, pachyderm, pangolin, plantigrade mammal, primate, proboscidean, rodent, tree shrew, Unguiculata, unguiculate, Ungulata, ungulate, yearling