Search for a genus or species among the great extinct reptiles of the Mesozoic.
These famous mummies contain no fossilized skin: they are a thin clay layer, less than a millimetre thick, that moulded the body's outline as it decomposed.
Its jaws held several hundred teeth stacked in “dental batteries”, constantly replaced as they wore down.
Its first fossils were found in 1942 in Arizona, on Navajo Nation land, by Jesse Williams, a Navajo man.