A placental mammal with a well-developed placenta; relating to or belonging to the group of mammals that nourish offspring through a placenta.
From eutheria plus -an meaning 'of or belonging to.' Eutherian is the modern scientific classification for about 95% of living mammal species, including humans, whales, bats, and dogs.
Every pet, whale, and human is a eutherian—we're basically the VIP mammals because our placentas are so sophisticated that our babies develop further inside before birth than any other mammal group.
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