Argentinosaurus (meaning “Argentine lizard”) is a genus of titanosaur sauropod dinosaur first discovered by Guillermo Heredia in Argentina. The generic name refers to the country in which it was discovered. The dinosaur lived on the then-island continent of South America somewhere between 94 and 97 million years ago, during the Late Cretaceous Epoch. It is among the largest known dinosaurs.
Studies show that an Argentinosaurus do not stop growing their entire lives. One article found that Argentinosaurus hatchlings would have had to grow 25,000 times their original size before reaching adult size.