 Cuvier made another powerful demonstration of the power of comparative anatomy in paleontology when he presented a second paper in 1796 on a large fossil skeleton from Paraguay, which he named "Megatherium" and identified as a giant sloth by comparing its skull to those of two living species of tree sloth.Cuvier's ground-breaking work in paleontology and comparative anatomy led to the widespread acceptance of extinction.It also led Cuvier to advocate the geological theory of catastrophism to explain the succession of organisms revealed by the fossil record.