Palaeopropithecus is a recently extinct genus of large sloth lemurs from Madagascar related to living lemur species found there today. Three species are known, Palaeopropithecus ingens, P. maximus, and P. kelyus. Radiocarbon dates indicate that they may have survived until around 1300–1620 CE. Malagasy legends of the tretretretre or tratratratra are thought to refer to P. ingens. Evidence suggests a solely arboreal lifestyle with frequent upside down suspension, hence the name sloth lemur. Anatomy Palaeopropithecus primarily lived in the trees to stay away from predators as well as to gain valuable resources. To survive properly in the trees, Palaeopropithecus had long and powerful arms and legs, each with significantly long fingers and toes to allow them to hang upside down on branches. These were used to swing from branch to branch to travel across the jungle of Madagascar. These long arms made it much easier to grab hold of various trees and branches, making travel at the arboreal level easier. Laurie Godrey states in "The Extinct Sloth Lemurs of Madagascar", "Thus, these animals exhibit the odd behavioral combination of being both specialized leapers and adept climbers and hangers." The long arms of Palaeopropithecus had hook like extremities on their hands and feet. This benefited Palaeopropithecus by enabling them to hook their bodies onto the foliage to stabilize themselves as they traversed through the trees. Palaeopropithecus on average weighed between -. This weight is heavier than most modern lemurs and could potentially have caused the species to fall while hanging on branches, forcing the species to make sufficient use of their long arms and legs to survive. Palaeopropithecus eating habits were different from those of modern lemurs. The teeth of Palaeoprophithecus indicate that the animal was folivorous to eat leaves and tougher so they can eat hard foods such as nuts and seeds. This helped them fill out a generalized niche where they had multiple food resources to rely on. The anatomy of their bones were generally curved with a sixty-degree bend on major bones in the legs and arms. These bones were much denser than normal and with the addition of the curved structure of the bones it allowed Palaeopropithecus an easier capability to swing from branch to branch. This "curvature indicates that the sloth lemurs are one of the most suspensory clades of mammals ever to evolve. The curved bones also helped them gain more torque and speed allowing,