Video Extras
The Ghost Experiment
Chimps that watch how other chimps retrieve a grape
from a trick box can pick up the skill. But researcher
Lydia Hopper wanted to see whether chimps could learn
the same skill after seeing the trick box opened by a
ghostly, invisible thread.
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An Indirect Approach
In this short outtake, primatologist Brian Hare tests
whether a bonobo can figure out how to get an apple
slice precariously perched on a window sill.
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© | Created
January 2008
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