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The best animal photos of November

Dec. 1, 2011, 7:55 a.m.
A large male Bornean orangutan looks down from an overhead line at the Smithsonian National Zoo in Washington, D.C. on Nov. 27.

Photo: Andrew Reding/Flickr

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Orangutan tight rope

A large male Bornean orangutan looks down from an overhead line on Nov. 27 at the Smithsonian National Zoo in Washington, D.C.

The zoo's overhead line (also known as the O-line) connects nine towers with cables inside the enclosure, allowing the orangutans to simulate the natural instinct of swinging from tree to tree.