Exhibit Opens for Titanosaur, One of the Largest Dinosaurs Ever

A replica of one of the largest dinosaurs ever discovered is unveiled at the American Museum of Natural History on January 14, 2016 in New York City. (Spencer Platt/Getty Images)

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It’s difficult to know for sure which dinosaur is the largest ever because usually only a fraction of a dinosaur’s fossils are ever found. We only have 40 percent of the Titanosaurus’s bones, Mark Norell, chair of the paleontology division at the Museum, told Wired, and much of the size of the animal is extrapolated from its thigh bone.

The replica of the Argentinosaurus at the Carmen Funes Museum, at 130 feet long according to the Science Times, in Argentina is even larger than the Titanosaurus on display in New York. The Argentinosaurus holds the informal title for the largest dinosaur ever.