00:00Deep inside the caves of Central and South America, vampire bats have a chilling habit.
00:05They drink blood. But what's even stranger, is that they share it.
00:09After a successful night, a vampire bat feeds on the blood of livestock.
00:19But not every bat gets lucky. And for them, the risk is deadly.
00:24Go three nights without food, and they can starve.
00:27That's when friendship comes into play.
00:31Well-fed bats will actually regurgitate blood into the mouths of hungry roostmates, a life-saving donation.
00:39But this isn't just kindness. Scientists call it reciprocal altruism.
00:43Today I help you, tomorrow you help me, you help me.
00:47They strengthen their social bonds through grooming and sharing, creating a trust network that ensures survival for the entire colony.
00:53So while vampire bats may sound terrifying, their world is built on an unlikely rule, survival through generosity.
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