How can a camel defend itself against predators?

Not many camels exist in the wild, but their main predators are wolves, Caspian tigers, Asiatic lion, and of course humans which we have domesticated them.
Only in areas where there are also big cats (lions, leopards, jaguars, cougars), wolves, hyenas, or jackals. Many camels live in areas inhospitable to these predators. And, of course, man has both hunted and domesticated camels for thousands of years.