 Despite having been selectively logged in the 1970s, the forest is still considered among the most biodiverse on the planet, containing about 20% of the remaining lowland forests of Sumatra.It provides habitat to over 300 species of bird, as well as the critically endangered Sumatran tiger and Sumatran elephant.The Harapan Rainforest is managed under a 95-year license by a group of NGOs comprising Burung Indonesia, Birdlife International and the Royal Society for the Protection of Birds.