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Placental mammals, also known simply as mammals, are warm-blooded animals characterized by their mammary glands which produce milk to feed their young. They are further classified as placental mammals due to the presence of a placenta, an organ that develops in the uterus during pregnancy and provides oxygen and nutrients to the developing fetus. This group includes a diverse range of animals such as primates, rodents, carnivores, ungulates, and marsupials, among others. Placental mammals are found on every continent except Antarctica and inhabit a wide variety of ecosystems, from forests and grasslands to deserts and oceans. They display a high degree of intelligence and social behavior, with complex communication systems and the ability to form long-term relationships. Additionally, placental mammals have evolved sophisticated sensory abilities, including sight, hearing, touch, taste, and smell, which allow them to navigate their environment and interact with other organisms. Overall, placental mammals are a diverse and successful group of animals that play a vital role in maintaining the balance of ecosystems around the world.