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Extinct mammals are a unique group within the field of fossil mammals, which in turn fall under the larger umbrella of fossil vertebrates and fossil animals. This category encompasses all mammal species that once roamed the earth but have since died out and left behind only their fossilized remains for study. These ancient creatures are an important part of our planet's natural history, providing valuable insights into the evolution and ecology of modern mammals. The extinct mammals category is characterized by a diverse array of species, each with its own set of unique adaptations and characteristics. Some of these extinct mammals were similar in appearance to their living relatives, while others were quite unlike anything seen today. The study of extinct mammals helps us understand the factors that have contributed to the extinction of certain species, as well as the role that climate change and human activity have played in shaping the planet's biosphere over time. Despite their status as extinct, these ancient mammals continue to captivate researchers and the public alike. Through the study of fossils, we can piece together a picture of what life was like for these fascinating creatures and learn more about our own place in the natural world.