Mammals have developed various adaptations to survive in their environments. For instance, some mammals, like polar bears, have thick fur and a layer of fat to insulate against cold temperatures. Others, such as camels, have adaptations that allow them to conserve water in arid conditions, enabling them to thrive in deserts. Additionally, mammals exhibit diverse reproductive strategies. For example, marsupials, like kangaroos, give birth to underdeveloped young that continue to grow in a pouch. In contrast, placental mammals, such as humans, nourish their young through a placenta during gestation, allowing for more developed offspring at birth.