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Most mammals , including the six most species-rich orders, belong to the placental group. The three largest orders in numbers of species are Rodentia: mice, rats, porcupines, beavers, capybaras, and other gnawing mammals ; Chiroptera: bats; and Eulipotyphla: shrews, moles, and solenodons. Learn about mammals, a group of complex warm-blooded animals with mammary glands, hair, and three middle ear bones. Find out their diversity, classification, organ systems, and adaptations. Learn about the characteristics, types, and examples of mammals, the warm-blooded vertebrates that have hair or fur and produce milk. Find out the differences between monotremes, marsupials, and placental mammals, and see photos of various mammals. Introduction Mammals are an incredibly diverse group of vertebrates that occupy nearly every habitat on Earth. Their evolution, complex behaviors, and unique physical traits have made them one of the most fascinating classes in the animal kingdom. In this introduction, we explore what mammals are, how they are classified, and trace their evolutionary journey from early synapsids to the modern species we know today.