One of the Jurassic World Evolution dinosaurs I had the chance to work on at Frontier Developments. The Triceratops was based on the original Triceratops in Jurassic Park. Lowpoly and UV's done by outsource.
We used a technique where we create a dinosaur using only a 1024 normal map together with 16 tileable materials at 512 resolution blended together to create a really high resolution in game.