Brontolith

Brontoliths were once large docile organisms indigenous to an unspecified homeworld. Unfortunately for all, they were discovered and subsequently absorbed into the Zerg Swarm, transmogrifying their once pristine forms into gruesomely cruel jokes of their former selves. They were now to become known as the Ultralisks, which would come to bear little resemblance to their predecessors. As with nearly all other organisms absorbed into the Zerg Swarm, they are very likely extinct, especially so if they were not sapient.