The Trans-Organics were the first creation of the Quintessons, predating even the Transformers themselves. Large by even Transformers standards, the beasts were deemed ill-fit for even the most simple of tasks. Too violent, uncontrollable, the beasts seem only fit one thing and one thing only: destruction.
The Transformers cartoon
Seven Trans-Organics were unearthed by Galvatron and his forces in a Quintesson trap. They are: A gorilla like beast with green tendrils for arms (vaguely resembling the D&D demon prince Demogorgon), a largely metal white snake, an almost completely metallized bird, a brown ankylosauric creature, a half-robotic bear, and a frog-like creature with a bear trap on its back and a camera for an eye.
The seventh was far larger still, the vampiric energy sucking worm known as the Dweller.
It simply destroyed the others.