Sometimes they are built for protection against wild animals. In some parts of the tropics, houses are either fastened to trees or elevated on stilts. This is to keep the living quarters above the ground to protect occupants. A tree house can also be a place to store food from scavenging animals. The Korowai, a Papuan tribe in the southeast of Irian Jaya, live in tree houses. Some are nearly high (see image below). They are used as protection against a tribe of neighbouring head-hunters, the Citak.