Command and Conquer: The Covert Ops
At the dos prompt 'C:C&C>' type "C&C funpark". Then you push "enter". Then choose "NOD". It gives you 5 secret levels. In the first, you can kill the dinosaurs and on the 5th, you can be the dinosaurs. There you go, have fun!
Thanks to Revolution readers Matt Duchowny and The Warlord!