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As Joy recalled, "I actually really enjoyed observing and measuring the mangabeys' climbing behavior in the videos. They're adorable animals, and despite the fact that they were different individuals, I named them all Geronimo."

So far, however, only six wild animals trapped in Africa have yielded the virus: three rope squirrels, a Gambian rat, a shrew, and a sooty mangabey monkey.

After a kilometre or so, they passed a group of sooty mangabey monkeys lounging on logs.

What would we give today to have averted the pandemic of HIV/AIDS, a lentivirus that was traced to human contact with infected chimpanzees and sooty mangabeys in West Africa?

The marked flies kept turning up around the mangabeys, even 12 days later when the group had moved more than 1 kilometer away, the team reports in Molecular Ecology.