Photos from working for the Orang-utan Health project in the Gunung Leuser National Park, North Sumatra, Indonesia.
Butterflies licking up salts. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Mother and baby semi-wild orang-utans. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Female Sumatran orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Flanged sub-dominant male Sumatran orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Mother and baby Sumatran orang-utans. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Toad. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Fully wild mother and baby Sumatran orang-utans. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Wild mother and baby orang-utans. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Frog. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Swinging mother and baby Sumatran orang-utans. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Semi-wild mother & baby orang-utans. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Wild baby orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
White-handed gibbons. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Canopy emergent with developing strangler fig. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
River frog. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Baby orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Semi-wild female orang-utan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Juvenile semi-wild orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Semi-wild baby orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Male Sumatran orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Millipede. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Male Sumatran orangutan feeding on figs. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Semi-wild juvenile orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Fungi. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Nesting female orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Flanged male orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Gliding lizard. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Beetle. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Wild female Sumatran orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Spider. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
White-handed gibbons. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Juvenile semi-wild orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Female semi-wild orangutan after feeding on termites. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Baby orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Mating frogs. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Wild female Sumatran orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Half-blind semi-wild female orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Wild female sumatran orangutan feeding on fig leaves. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Whiskered treeswift. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Wild orangutan swinging in a strangler fig tree. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Long-tailed macaque. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Male Sumatran orangutan feeding on figs. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Moth. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Thomas leaf monkey. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Toad. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Wild female Sumatran orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Sub-dominant male orangutan. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Male Sumatran orangutan feeding. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Thomas leaf monkey. Gunung Leuser National Park, Sumatra, Indonesia. Photo copyright: David Bartholomew
Bartholomew Biology 