They trained rhesus monkeys on a task that was, in a crude sense, a monkey IQ test.

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This invited abuse from them, in much the same way that once isolated rhesus monkeys seemed to invite abuse from the colony.

NEWYORKER: Hellhole

There is still no proof that restricting calories extends human life spans, however, and two recent studies with rhesus monkeys produced conflicting results.

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Then Harry Harlow, a professor of psychology at the University of Wisconsin at Madison, produced a series of influential studies involving baby rhesus monkeys.

NEWYORKER: Hellhole

Tests on rhesus monkeys are ongoing and look promising so far.

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Story Book Farm Primate Sanctuary currently has 22 monkeys on site, with Darwin and two female rhesus monkeys scheduled to arrive over the next few weeks.

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He successfully implanted his device in normal rhesus monkeys without disturbing their hearing or sense of balance, and he was able to spark the vestibular system so that the monkeys' eyes moved as if they were spinning.

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The researchers will look to see if their immune systems respond to the booster shots in the same way that those of the rhesus macaque monkeys did.

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