system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are most animals seemingly unaffected by / unafraid of the presence of most other animals but immediately flee at the sight of a human

An example of what I mean would be why birds and squirrels or a deer and a hawk or a dolphin and a sea turtle coexist within close range unphased by each others company, but flee when they see a human.
gpt
Eyeballs. Predetors usually have their eyeballs on the front of their heads (think human, wolf, lion) where prey have their eyeballs on the side of their heads (think deer, rabbit, mouse).

It's like a big red flag for animals.