Maj is a Maxis-made creature, present in the final game.
It resemble little to raptor, it is a green-scaled, yellow-striped limbs and light grey underbelly, possesses Grubblemaw mouth, Grumpeye eyes, Overhear ears, Batboy to its head and tail, Velocigraspers graspers, Scareclaw feet, and 6 each of Osteoflippy on its back.
Notably, there are 2 Maj's in Maxis' Sporepedia, and they are totally equal. This is probably an mistake by Maxis.