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

I want to add that flies often don’t want to leave. I doors usually way better temperature, humidity, etc. and there’s tons of food there. That can be why they bee-line to get inside (no pun intended) and don’t leave.