Placentals are a group of mammals characterized by their unique reproductive system, which involves the presence of a placenta that nourishes the developing fetus during gestation. This adaptation allows for a longer gestation period, resulting in more developed young at birth compared to other mammal groups, like marsupials and monotremes. Placentals exhibit a wide range of body sizes, reproductive strategies, and ecological niches, making them one of the most diverse and successful groups of mammals.
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