system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do animals know to look humans in the eye? Why do they do it?
gpt
Even for animals the basic understanding of what eyes are is important for survival. How do you know if that predator is looking at you, or if the fellow animal of your species feels threatened? How does a predator know if it is being observed or which direction the prey is likely to flee? Even fish can recognize eyes which is why the fake eye spots on tails even exist!

So yeah, animals know to look at the eyes of humans because that is what we see with. Some important things they can get from our eyes is our direction of sight, from which they can deduce where our attention is directed.