It is thought that camels come from the Middle East, but actually camels originated in North America over 50 million years ago and stood about one foot tall at the shoulder. Approximately 10,000 years ago all remaining camels in North America died out for unknown reasons. Camels were considered a wild animal up until about 2,000 years ago. Contrary to popular belief, camels DO NOT spit. If a camel is extremely upset or has learned bad behavior, a camel may vary rarely vomit regurgitated cud, but even then, this will rarely hit a person. It is also said that camels have water in their hump. The hump is actually made of fatty tissue, it will only disappear when the camel has been without food for extended periods. Through efficient methods the camel can recycle the water within its body. Camels are very vocal, social, and affectionate animals that have developed a high intelligence to help them survive in the harsh desert environment. Camels communicate via low rumbles, moans, groans, and bellows, that to a person unfamiliar with camels, would sound threatening. Camel milk has the highest vitamin C content ever tested and is closer to human milk than to cow or goat milk. They have 3 stomachs and chew their cud like cows. They don't have hard hooves, they have soft padded feet. A camel can maintain speeds of up to 18 km/hour for 18 hours, the world's best endurance runner.