Many important hominid fossils have been found in Tanzania, such as 6-million-year-old Pliocene hominid fossils. An abundance of hominid fossils have been discovered in the area surrounding Lake Turkana. The original meaning of "hominid" referred only to humans ("Homo") and their closest extinct relatives. It is the second oldest fossil hominid in the world after "Sahelanthropus tchadensis". The current, 21st-century meaning of "hominid" includes all the great apes including humans. Tanzania is home to some of the oldest hominid settlements unearthed by archaeologists. Specialized suspensory behaviour was shown to have evolved independently between hominid groups. Subsequently, many species of early hominid have been discovered in Kenya. They date back 1.83 million years, the oldest evidence of hominid habitation in Southeast Asia. The oldest evidence of hominid habitation in Jordan dates back at least 200,000 years. Many more species of early hominid have come to light in recent decades. An ancient hominid from 3 Million years ago had gum disease. Sahelanthropus tchadensis is the scientific name of the first hominid bones found on earth. There is no evidence in Assam and Northeast India of early hominid dispersal. These remains are among the oldest hominid remains ever found.