Argentinosaurus: The heavyweight champion of the dinosaurs may have been a sauropod discovered in South America called Argentinosaurus. This behemoth was over a hundred feet long and weighed nearly one hundred tons. Argentinosaurus was a member of a family of Cretaceous Period sauropods which are fittingly called "titanosaurs".

Genus Name: Argentinosaurus ("Argentina lizard")
Type Species: * A. huinculensis (Bonaparte & Coria, 1993)
Length: about 130 feet (40 meters)
Weight: up to 100 tons
Time: Late Cretaceous
Place: Argentina
Diet: plant-eater (herbivore)