These things are great for getting away from predators like raptors, who don’t have much stamina. While on all fours, the iguanodon has infinite stamina while walking or running. Boosting speed with levels make it much easier to get away from an attacker.
I can’t stress how good these are. If you pump movement for a while they can be great for use in a taming pin they can jump over at least 2 or 3 high walls if in gather mode and run the sprint mode with lvs in movement it can outrun most animals on the island. On top of that later in the game gather berries with it and turn the into seeds for a lighter non-sloiling food source. One seed weights .01and gives 1 food.