Headhunting is the practice of hunting a human and collecting the severed head after killing the victim, although sometimes more portable body parts (such as ear, nose or scalp) are taken instead as trophies. Headhunting was practiced in historic times in parts of Europe, East Asia, Oceania, Southeast Asia, South Asia, Mesoamerica, South America, West Africa and Central Africa. The headhunting practice has been the subject of intense study within the anthropological community, where scholars try to assess and interpret its social roles, functions, and motivations. Anthropological writings explore themes in headhunting that include mortification of the rival, ritual violence, cosmological balance, the display of manhood, cannibalism, dominance over the body and soul of his enemies in life and afterlife, as a trophy and proof of killing (achievement in hunting), show of greatness, prestige by taking on a rival's spirit and power, and as a means of securing the services of the victim as a slave in the afterlife. Today's scholars generally agree that headhunting's primary function was ritual and ceremonial. It was part of the process of structuring, reinforcing, and defending hierarchical relationships between communities and individuals. Some experts theorize that the practice stemmed from the belief that the head contained "soul matter" or life force, which could be harnessed through its capture. Headhunting was practiced by many Austronesian people in Southeast Asia and the Pacific Islands. Headhunting has at one time or another been practiced among most of the peoples of Melanesia, including New Guinea. A missionary found 10,000 skulls in a community longhouse on Goaribari Island in 1901. Historically, the Marind-anim in New Guinea were famed because of their headhunting. The practice was rooted in their belief system and linked to the name-giving of the newborn. The skull was believed to contain a mana-like force. Headhunting was not motivated primarily by cannibalism, but the dead person's flesh was consumed in ceremonies following the capture and killing.