Pterosaur: Dawn of Destruction is a cancelled platform / action game that was in development at Atomic Planet in 2002, for the GameCube, Playstation 2 and Xbox. In the game the player would had used a Pterosaur (a flying reptile) to lead your fellow dinosaurs to safety, or see them condemned to extinction, while the world was coming to an end.
To do that, you had to learn to recognise the most vulnerable dinosaurs and how they behave, to be able to save them. While bigger dino-predators were searching for the weaker dinos to eat, they could have been lured away or defeated in an open battle. The scenario could have been explored to find hidden paths, with the help of friendly dinosaurs that cleared the way.
The Pterosaur project was never released for unknow reasons, but we can speculate that the gameplay was not that much fun and Atomic Planet was not able to find any publisher interested in the game. On the 25th of February 2009 Atomic Planet went into administration after a number of redundancies and the offices were closed: maybe a playable demo of Pterosaur: Dawn of Destruction could be leaked sooner or later.