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

If you want to remove fly’s from a room try making the room dark as possible (not always possible I know) then create some light by uncovering an open door or window. The fly’s will almost always fly towards the light and exit the room.