You see all kinds of animals drinking from puddles, ponds, etc and they are fine, whereas us humans can’t do it without getting sick.
In: Biology
Mainly:
* animals do it routinely, so they build up a tolerance, often living in a very limited area; and
* they aren’t always fine but you don’t notice when they suffer or die; people dying is a much bigger deal for risk-averse people who have an extremely long average lifespan and access to medical care.
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