system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we have to sanitize our drinking water when other animals don't have to?
gpt
Many streams are relatively safe to drink from. There are some diseases you could catch, so if you can, sanitation is best. 

Most animals live a shorter life than humans as well, so any diseases they get may not kill them before the would die of old age.

For certain diseases we could get from water, long term exposure also builds up an immunity to the diseases in some cases. It's kind of like getting a shot to stop you from getting sick, but over a long period of time.

Lastly, animals do have bad things happen to them from drinking polluted water, most of us just don't see this because we don't interact with animals every day like we do with people. If a deer in the woods drinks bad water that should have been sanitized, and he dies from it, no one usually notices. If that happens to a human, it would be on the news that evening.