Dinosaurs are supposedly sighted in the forested areas of the state with players, claiming the herbivorous dinosaurs are docile, while carnivores are hostile.
The myth has been abandoned due to the majority of evidence clearly being the result of a mod with screenshots showing high-resolution textures more detailed than the game's own, advanced animations whose complexity is not present reflected elsewhere in the game, and Mesa vehicle skin mods inspired by Jeeps from the movie Jurassic Park.
- In Grand Theft Auto V, an artificial purple dinosaur can be found near RON Alternates Wind Farm. The dinosaur most likely references Barney the Dinosaur.
- Dinosaurs are frequently mentioned by the Epsilon Program, who consider them a lie fabricated by scientists to fool weak-minded people. This is likely a reference to multiple real-world conspiracy theories claiming dinosaurs are an elaborate hoax.
- In GTA IV, there is a fossil of a Tyrannosaurus Rex and a Triceratops at The Libertonian museum.