Argentinosaurus huinculensis

Skull of Argentinosaurus huinculensis

Argentinosaurus (“Argentina lizard”) was a sauropod dinosaur who lived during the Cretaceous, about 95 million years ago. Remains were first discovered by F. Romero in 1980 in the Rio Limay Formation, Neuquén Province, Patagonia, Argentina. More material was discovered by José Bonaparte and Martín Vince in 1989. The excavation of the skeleton is still going on, but besides the skull, vertebrae over 5 feet (1.65 meters) tall, and a fibula of similar size (1.60 meters) have been found. Based on this, Argentinosaurus is the leading contender for largest land animal ever, with an estimated length of 130 feet (40 meters)!