The two monkeys were part of the joint Russian-American Bion 11 mission in 1997, flying aboard the space shuttle.
Chen was building on research from Emory University's Yerkes National Primate Research Center, which has been working with capuchins for years because of their strong instincts for cooperation and working in groups (in the wild, they eat large squirrels, which require at least two monkeys to capture).
In a 2008 study, de Waal and colleagues put two capuchin monkeys side by side and gave them a simple task to complete: Giving a rock to the experimenter.
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.
Silva says she has raised two other baby monkeys and both of those were freed in different parts of the country.
This latest research was carried out on two groups of monkeys.
And they're awaiting the arrival of two Cotton-Top Tamarin monkeys, who, among other activities, will be trained to Skype.
There is still no proof that restricting calories extends human life spans, however, and two recent studies with rhesus monkeys produced conflicting results.
In third place behind Depp is Brad Pitt, who has two nominations: one for Twelve Monkeys and another for last year's The Curious Case of Benjamin Button.
The training lasts from two weeks to a few months, and can be harsh: the monkeys learn by being punished for bad behaviour and rewarded for good.
Laze by the pool, indulge in a long lunch while monkeys cavort in the trees and knock back a coconut feni or two (the local Goan firewater), and you will truly appreciate the meaning of a good Goan susegad.
Although vaccinated monkeys did not die from the disease after inhaling anthrax spores, they were still ill for two weeks.
At Corcovado you can find tapirs, jaguars, pumas, anteaters, two-toed and three-toed sloths, golden orb spiders, moon crabs, a diversification of monkeys (including all four types of Costa Rican monkeys, found only in Corcovado), crocodiles, poison dart frogs, pelicans, 220 species of butterflies, scarlet macaws and even the rare and venomous fer-de-lance snake.
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