system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can animals drink dirty water safely but humans can't?
gpt
Animals cannot drink dirty water safely. Humans also cannot drink dirty water safely. As many humans have access to alternatives (clean safe water) we do not tolerate the risk unless forced to do so.

Animals have no choice but to tolerate the risk, and so they risk contaminants, toxins, parasites, and disease because the alternative is dying of thirst. Many animals are rife with parasites and other conditions we would not ordinarily tolerate.