When you have rexes, carnos and this type of dinos, have also an army of 10 or more of these and they will help defeating most of enemies, but the army isn't recomended for caves, redwoods or too dangerous missions. Lost mine fighting 2 theris and an alpha raptor, all my 20 dinos died, but my rex named dog killed the theris and the raptor. 1 up= 1 f for my dinos