A camel with one hump is called a dromedary; a camel with two humps is a Bactrian.
Which reminds me, if you haven't seen this documentary, you must! It won an Oscar for Best Documentary several years ago and is excellent. Prepare to cry in a good way. Let me know if you saw it or after you watch it. I'm going to rent it again from blockbuster.com. I think it's on Netflix, too.