|LEGO → Dinosaurs|
6721 Mosasaurus is a Dinosaurs themed set released in 2001. This set can be rebuilt into three other prehistoric creatures: Dimetrodon, Iguanodon, and Postosuchus. The tongue is actually a Crocodile head in a red colour.
Mosasaurus (which means "lizard of the Meuse River") was a large genus of Mosasaur from prehistory, measuring 48 feet long.