Crocodile
During Mesozoic and early Cenozoic times, crocodylomorphs were far more diverse than they are now. Triassic forms were small, lightly built, active terrestrial animals.  These were a mixed group of small-bodied forms with long limbs that walked upright. This was the ancestral form of the Crocodylomorphs. These forms persisted until the end of the Jurassic.