system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do humans express themselves in different ways (eg act cranky, get angry etc. ) when they are in pain or discomfort or are sick whereas animals just seem to "deal with it" quietly?

For example, if my puppy is sick, she will just lie down and not do anything whereas human babies get cranky and cry in the same situation.
gpt
Because we are social animals. *Extremely* social.

Dogs and cats will often stay quiet when they are sick, because drawing attention to themselves when sick is the *last* thing they want to do in the wild, so evolutionary factors have driven them to hide signs of weakness. The obviously sick gazelle is the one that gets focused on and eaten, and thus doesn't get as much of an opportunity to reproduce.

Humans on the other hand have evolved to be extremely social. We rely and depend on each other. So when we are sick, we benefit more from showing that we have discomfort so our parents can give us better care, since we are not at risk of predation as a result of getting fussy (and if we would have been on our own we also weren't solitary or even family-unit creatures but instead members of much larger communities and our tribesmen would protect us).