All animals as big as Eddie or larger can be ridden. Hit a creature with
a bolt of lightning to stun them. Then, get near them, and press Y.
While riding them, press A to perform an attack specific to that
creature. Raptor Elk and Tullusks are a couple examples of creatures
with melee attacks, while the Laser Panther shoots lasers from its eyes.
The large wooden horse creatures in the final map area (with large
swinging axes for tails) can also be ridden.