Size
Size matters in many scenarios.
Current sizes of several in-game, playable creatures are given here:
Acrocanthosaurus: 900 Apatosaurus: 5000 Elasmosaurus: 750 Mosasaurus: 3300 Pachycephalosaurus: 300 Parasaurolophus: 1100 Utahraptor: 300 Velociraptor: 100
Size Directly Influences these Mechanics
The following mechanics are directly related to size, as they use the size stat directly in the game's code.
The size of a creature determines how large of a Carcass it will drop upon death. Larger creatures generate larger carcasses, and thus provide more food.
Size determines strength of knockback. The larger one creature is in relation to the other, the harder the knockback force. Overeating can also influence this mechanic as well.
Size determines what is pounceable by creatures with pouncing mechanics such as Utahraptor and Velociraptor.
Size determines what is grabbable by creatures with grabbing mechanics such as Elasmosaurus and Mosasaurus.
Size is part of what determines how many points a player will receive for successfully hunting another player.
Size often Correlates with these Mechanics
While not directly influencing these mechanics, often size correlates with other mechanics such as these:
Larger creatures with a higher size stat almost always have a higher foliage grade, which determines what foliage on the map is able to be eaten or trampled by that creature.
Larger creatures with a higher size stat are more likely to have slower metabolisms, requiring food less often.
Smaller creatures often are more forgiving of falls.
Smaller creatures are often more forgiving of tripping.