San Diego Zoo Global
San Diego Zoo: Orangutan
This resource provides extensive information about the orangutan, including photos, an audio clip and a video. [0:32]
BBC
Bbc: Nature Wildfacts: Bornean Orangutan
This site has a detailed fact sheet on the Bornean orangutan.
BBC
Bbc: Nature Wildfacts: Sumatran Orangutan
This resource provides information about the Sumatran orangutan.
Other
The Sumatran Orangutan Society
This site from the Sumatran Orangutan Society is dedicated to conservation and providing information about orangutangs.