
If this monkey looks bewildered, it could be because of the excitement it has generated among biologists. A uacari monkey living in north-western Amazonia, it belongs to a species unknown to science until recently but is now named Cacajao ayresii in honour of Brazilian biologist Marcio Ayres, who pioneered field studies on uacaris.
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Note: The monkey in this picture is a uacari, but I believe it is not the same species of uacari that is discussed in the article.