Orangutan climbing down a tree after a good night's rest.
Orangutan nest viewed from above
Orangutans bend growing branches to make their nests.
An orangutan nest high up in the forest canopy.
Researchers find a lazy orangutan, still sleeping in nest.
A researcher up in the trees by an orangutan nest.
Orangutans up in the trees
Orangutans in the trees.
A chimpanzee lounging in his nest.
A researcher taking over a chimpanzee nest.
A chimpanzee in his nest.
A chimpanzee nest in Kenya.
University of Cambridge Anthropologist Fiona Stewart perches in a chimp nest. Stewart spent 6 nights crashing in chimp nests to test what benefits sleeping in these assemblages brings to the apes.