Where do fruit flies come from? They don't just 'magically appear.

Where do Fruit Flies Come From, Live, and Hide

Keep Fruit Flies Out Of Your Kitchen With Duct Tape

Where Do Fruit Flies Come From?

Where Do Gnats Come From? - Learn What Attracts Gnat Flies

How do flies detect food when outdoors (they seemingly don't exist until food is present - from where do they come?)? - Quora

Where do fruit flies come from? - Franklin Pest Solutions

Hangry' male fruit flies attack each other if they go without food

How do fruit flies appear out of nowhere when fruit is left out for too long? - Quora

Easy and effective ways to get rid of fruit flies at home

How to get rid of fruit flies

Inside the race to stop lanternflies—before they get to a town near you