Extinct mammals were incredible creatures that once roamed the Earth but are no longer alive today. These animals included woolly mammoths, saber-toothed cats, and giant ground sloths that were much larger than modern mammals. Many extinct mammals were designed with special features like the mammoth's thick fur for cold climates or the saber-tooth's long curved teeth for hunting.
Some extinct mammals like the woolly mammoth lived during the Ice Age and had thick coats and curved tusks to survive in freezing conditions. Others like the giant ground sloth grew to the size of elephants and ate plants from tall trees. Scientists study fossils, frozen remains, and cave paintings to learn about these amazing extinct mammals and understand how mammals lived long ago.