Camels have adapted in many ways to survive in the harsh desert environment. They can go long periods without food or water. Camels have a tough lining in their mouth that allows them to eat sharp, thorny desert plants. They store fat in their hump and can rechew food. Camels can also go long periods without water and drink up to 46 liters at once when water is available. They have adaptations like closable nostrils, eyelashes, and hairy ears to protect from sand and sun. Camels regulate their body temperature to reduce sweating and grow wool in winter. Their thick knees and padded hooves allow walking on hot sand and traveling long distances to carry goods.