Xeno-Species

This would be a huge herbivore that wanders the grass lands

Raptors would also be a perfect species for the grasslands.

This Paras is an herbivore and would be a food supply for the Raptors

This was an experiment.
Perhaps genetically engineered to adapt to the new planet?

This is the equivalent of a Deer on the new planet,
they're everywhere on the grass lands.