system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do flies keep circling your face even after posing threats like swatting at them several times?

We've had the same needy fly in our home for days and swatted at it (with our hands) many times but it still keeping flying in close proximity to us rather than retreating to a part of the house that's safer. Why do they insist on making their presence known?
gpt
Bugs for the most part tend to act on their base instincts and their behaviour is almost entirely autonomous. They don't really think consciously about stuff, or have the kind of "danger zone" warnings that a mammal would. 

That's why they fly straight into the fly zapper, or the fly paper, and why they face-slam the window despite it being open wide.