Image # 222147
Lang's note: Common white nosed and red tailed Cercopithecus, male. No skin. Niangara, Congo Belge, June 1913.

It was hard for Lang to photograph living animals in the field. For one thing, they rarely stayed still during the long exposures required in photography's early years. However, Lang took quite a few good portraits of primates, such as this red-tailed monkey (Cercopithecus ascanius), and he was a master at making them appear to be alive.

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