The first big adaptation in crocodiles has occurred! The Phythosaur was alive during the early Jurassic period. They are closely related to crocodilians and are Herbivores as a result of more vegetation in their habitat. They looked much like modern day crocodiles, except their nostrils were located on the top of their head rather than the tops of their snout. Vegetation seems to grow lesser and hunting animals mey be more efficient.