In zoology, the group of mammals that are placental mammals, having a well-developed placenta for fetal nourishment.
From Greek eu- 'well' plus theria 'wild beasts' or 'mammals.' Scientists coined this term in the 19th century to classify mammals with fully developed placentas.
Scientists sorted mammals by their wombs: placentals (eutheria), marsupials (metatheria), and egg-layers (monotremes)—you're a eutherian, which means your mom gave you the deluxe VIP prenatal treatment 200 million years in the making!
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