Alvarezsaurus was featured in the Discovery Channel television series Dinosaur Planet , which speculated that it was a predator of young Saltasaurus , although these species did not exist at the same time , Alvarezsaurus being about 5 million years older than Saltasaurus . Alvarezsaurus was featured in the Discovery Channel television series Dinosaur Planet , which speculated that it was a predator of young Saltasaurus , though these species did not exist at the same time , Alvarezsaurus being about 5 million years older than Saltasaurus .