The Official Guide to the Minecraft Mod - The Prehistoric World
Carnivores
Carnivores are predators that will hunt the player, no matter if the player attacks first. They also will hunt other creatures (including dinosaurs) that they specifically have in their diet.
Herbivores
Herbivores are usually neutral mobs. They will not attack you on sight as you aren't provoking them. But do attack them and they will fight you back. They also will occasionally eat grass.
Omnivores
Omnivores are dinosaurs that can eat both meat and plants. Unlike herbivores, which do not attack anything unless provoked, omnivores may hunt some animals for food.
Titanus
Titanus dinosaurs are genetically enhanced dinosaurs that have exaggerated predatory features. These overly aggressive creatures will attack anything on sight.
These are creatures in vanilla Minecrat that "can" be hunted by dinosaurs, depending on their diets.
These are the special abilities that some dinosaurs possess to aid them when fighting enemies.