Mu mwaka wa 1978 nibwo umushinga gorille des Montagnes watangiye, maze ingagi zo mu birunga ziherereye mu gice cy’u Rwanda zitangira kumenyerezwa gusurwa naba mukerarugendo.Kuva 1973 kugeza 1989,umubare w’ingagi zo mu birunga wariyongereye ziva kuri 261 zigera kuri 324. Abantu bamwe bakeka ko ubukerarugendo bwaba bwaragize uruhare muri uku kwiyongera kw'ingagi.