Altruism
YOUR LINK HERE:
http://youtube.com/watch?v=jKtOXvA14X4
Hank explains the evolutionary basis for altruistic behavior in animals, including vampire bats! • Like SciShow on Facebook: / scishow • Follow SciShow on Twitter: / scishow • References for this episode can be found in the Google document here: http://dft.ba/-2Wvz
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