Megadongos were a titanic ancient Dongo variant that went extinct sometime in the distant past. The exact cause of their extinction is unknown, but likely linked to the incessant wars between the native races of Death Mountain. Currently the only known remains of a Megadongo is the massive fossilized skeleton in the Dodongo's Cavern.
Megadongo's were massive creatures, dwarfing even King Dodongo. The individual whose remains lie in the Dodongo's Cavern was the size of a small town. Aside from their size, they appear similar to other Dongos, with a quadrupedal body plan, erect limbs, and a single horn cresting their head.