The Irish don't use screens in their windows. No mosquitos here. Flies can be a nuisance, which is why we have imported that great American invention, the screen door.
But this time of the year, late summer, bees have a way of getting in. A open jam jar or sugar bowl brings them humming.
Bees use honey for fuel. I read somewhere recently that they can fly 40 miles without a refill, which means they get something like 10 million miles per gallon. Pretty good technology.