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.twi...
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[theme music] Ever wonder why we like...do things for each other? Like why we help our friends move even though we hate doing it? And, for that matter, why a bee will sacrifice its life by stinging an intruder to protect the hive? Why would a vampire bat regurgitate blood into the mouth of another bat that hasn't eaten that day? Why?! That's a very nice vampire bat...I guess. Eugh! That's gross in like so many ways. It turns out that this is actually a pretty big question. Things like this have been stumping scientists for years. Charles Darwin thought that altruistic behavior was a potentially deal-breaking flaw for his theory of natural selection. If the game was survival of the fittest, natural selection couldn't possibly favor ...
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[theme music] Ever wonder why we like...do things for each other? Like why we help our friends move even though we hate doing it? And, for that matter, why a bee will sacrifice its life by stinging an intruder to protect the hive? Why would a vampire bat regurgitate blood into the mouth of another bat that hasn't eaten that day? Why?! That's a very nice vampire bat...I guess. Eugh! That's gross in like so many ways. It turns out that this is actually a pretty big question. Things like this have been stumping scientists for years. Charles Darwin thought that altruistic behavior was a potentially deal-breaking flaw for his theory of natural selection. If the game was survival of the fittest, natural selection couldn't possibly favor ...
