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3:29
YouTube
SciShow
Altruism
Hank explains the evolutionary basis for altruistic behavior in animals, including vampire bats! Like SciShow on Facebook: http://www.facebook.com/scishow Follow SciShow on Twitter: http://www.twitter.com/scishow References for this episode can be found in the Google document here: http://dft.ba/-2Wvz
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Jul 3, 2012
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