In 1978, Sinharaja Rain Forest was included in the international network of biosphere reserves, established and maintained as part of UNESCO’s Man and the Biosphere (MAB) program. In October 1988, this reserve, together with a northeastern extension of it, was declared Sri Lanka’s first National Wilderness Heritage Area. In December 1988, the Sinharaja Biosphere Reserve became Sri Lanka’s first natural site to be added to UNESCO World Heritage list.

Sinharaja Rain Forest is home to numerous indigenous birds. 19 of Sri Lanka’s 20 species of endemic bird species in Sri Lanka are found in the Sinharaja Reserve. Among the endangered birds are Sri Lanka Wood Pigeon, Green-Billed Coucal, Sri Lankan white-headed starling, Red-faced Malkoha, Green-billed Caucal, Sri Lanka Spur fowl Sri Lankan Blue Magpie, and Ashy-headed Babbler, all of which are endemic.