ELi5 Why can flys see you coming a mile off when you try to swat them…but they can never seem to find their way back out of an open door?

Question

ELi5 Why can flys see you coming a mile off when you try to swat them…but they can never seem to find their way back out of an open door?

In: 415

Answer 1

Fly eyes are setup very differently than mammals. You have 2 eyes that are great at color and detail. Flys have like 60 eye that really see changes in movement. If you think of you eye like a mirror and a flys eye like a disco ball. In the single mirror you can see fine details. The disco ball not so much, but you can catch movement from many more directions.

Also the fly has a « brain » of a well house fly