Information from: “Ethnologue: Languages of the World, 18th Edition” . Lewis, M. Paul, Gary F. Simons, and Charles D. Fennig · SIL International
60 percent certain, based on the evidence available
DATE OF INFO
MORE ON VITALITY
"Most adults over the age of 30."
Papua New Guinea
"Sandaun Province. 6 villages."
Information from: “Glottolog 2.3” . Hammarström, Harald & Forkel, Robert & Haspelmath, Martin & Nordhoff, Sebastian (2014)
Information from: “Sepik languages: checklist and preliminary classification” . Laycock, Donald C. (1973) , Wurm, Stephen A. · Australian National University, Research School of Pacific Studies, Department of Linguistics
20 percent certain, based on the evidence available