The ancient camel question is: One hump or two? Arabian camels, also known as dromedaries, have only one hump, but they employ it to great effect. The hump stores up to 80 pounds of fat ...

In fact, enduring the frigid tundra is how scientists think camels got their iconic hump in the first place, because what's inside helped them survive in an age when many other animals were wiped out.

In fact, enduring the frigid tundra is how scientists think camels got their iconic hump in the first place, because what's inside helped them survive in an age when many other animals were wiped out.