wich orangutan is larger borneo or sumatran

A number of orangutan rescue and rehabilitation projects operate in Borneo.

The Borneo Orangutan Survival Foundation (BOS) founded by Dr Willie Smits has rescue and rehabilitation centres at Wanariset in East Kalimantan and Nyaru Menteng, in Central Kalimantan founded and managed by Lone Drøscher Nielsen. BOS also works to save and recreate the fast disappearing rainforest habitat of the orangutan, at Samboja Lestari and Mawas.

Orangutan Foundation International, founded by Dr Birutė Galdikas, rescues and rehabilitates orangutans, preparing them for release back into protected areas of the Indonesian rain forest. In addition, OFI promotes the preservation of the rain forest itself.