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Nice Chimps.
http://www.sciencenewsforkids.org/articles/20070711/Note3.as...
Submitted by
Amarildo
25 months, 1 week, 5 days, 4 hours agoWhen an animal helps out another animal, it usually gets something valuable in return. For a long time, many scientists thought that only people could behave generously just because it feels good. This kind of behavior is called altruism.
Tags: chimpanzee.
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