A camel
A camel, as you might have guessed. The ones in Mongolia are Bactrian - or two humped - camels. They are quite common in the gobi, but you do also find them elsewhere in Mongolia. On this one, you can clearly see the peg through the nose to which the rope is fastened.
He (or she - I didn't check) mainly had his (or her) picture taken because he was blocking the door to the jeep. So I was left with not a lot to do but stand around. He actually stuck his head into the jeep at one point (or tried to) in an apparently attempt to check out my backpack lying on the seat.