Torosaurus

Torosaurus latus was a species of ceratopsid from the late Cretaceous period of the USA and Canada. Torosaurus is known to have the largest skull of any animal. Torosaurus was one of the largest ceratopsids ever at 8 to 9 metres long. Torosaurus like all quadreped ceratopsids couldn't run.

Trivia

 * A Triceratops was found in denver which is what the series based it on however it is now thought to have been a torosaurus. This wasn't known at the time.
 * Torosaurus like all dinosaurs wasn't pronated.
 * Torosaurus may be the same as triceratops.