Dark Sun - Destiny and sacrifice
Mekillots are mighty lizards that weight up to 6 tons, with huge mound-shaped bodies that can be thrity feet long. They are covered with a thick shell everywhere except for on their sides and bellies.
Mekillots are used as caravan beasts; a hitched pair can pull a full wagon at a slow pace. Mekillots are never truly tamed however, and the creatures have been known to go off the road and wander for days. They also like to make snacks of their handlers. Most caravans that use mekillots have a few psions to deal with the beasts.
In a fight mekillots attack with their tongues, much like how a frog snatches flies in mid flight.