Wikipedia:Today's featured article/July 6, 2011

Primates are a mammalian order which includes humans. Most non-human primates live in tropical or subtropical regions of the Americas, Africa, and Asia. Primates range in size from the Madame Berthe's mouse lemur, which weighs only 30 g, to the mountain gorilla, weighing 200 kg. According to fossil evidence, the primitive ancestors of primates may have existed in the late Cretaceous period around 65 million years ago, and the oldest known primate is the Late Paleocene Plesiadapis, c. 55–58 million years ago. Primates are characterized by their large brains, and increased reliance on stereoscopic vision at the expense of smell. These features are most marked in monkeys and apes, and noticeably less so in lorises and lemurs. Three-color vision has developed in some primates. Most also have opposable thumbs and some have prehensile tails. (more...)

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