Buck. Short for Buck Minster, long for Bu. This weasel is a completely psychotic character that guides our heroes in the world of dinosaurs. Having cut off all contact the world of the ice age, Buck resides in the middle of the dinosaurs and learned to survive despite its conflict with Rudy, who stole his right eye. However, Buck does not wish to return to the surface as he is inseparable from Rudy, and one does not go without the other.

The majority Ice Age fans were admired by the dynamism and the madness of this new character who takes the stones for phones but can not speak to the wind. Buck is thus a kind of mixture between Indiana Jones and Schwarzenegger who can do anything, anytime!