"If we do nothing, as many as one-quarter of all today's primates will be dead in 20 years, " Dr Mittermeier said.

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The camp allows about 20 students each year to work on projects researching the area's population of primates, led by Prof Volker Sommer from University College London.

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"It's a really important behaviour for primates and, of course, humans are primates too, " she says.

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For Changizi, this research on primates and color vision suggests that people's perception of colors must be consistent, given the way the eye's cones detect these specific subtle shifts in skin tone.

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"There's evidence that some non-human primates are averse to others receiving more than they receive, " he said.

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Using a technique developed using primates, Professor Aziz drilled two tiny holes into Sean's head and inserted electrodes.

BBC: Sean and Jeanette Gardner (BBC)

No, it's not the title of a wacky B movie, featuring primates amongst the stars in a bid for intergalactic dominance.

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So far the antiresearch crowd has forced the company to close a small operation that distributed primates in the U.K. Remarkably, antivivisectionists have not pursued Foster in the U.S. A bigger challenge to preclinical research may be to beat out such competitors as Covance, which originally specialized in human clinical trials, and MDS, a provider of contract drug discovery services.

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