Ferrucutus is a descendent of horned dinosaur from the 2005 film, King Kong.
The Stegosaurus was replaced by Ferrucutus in the remake.
The group were looking for Ann and the giant Ferrucutus appeared and begins to kill a lot of people and it was gunned down as it collapsed and its tail was moving although encountering this creature was a deleted scene.
Another Ferrucutus was at the watering hole.