Ants and flies are the 2 most common food pests. When the weather is hot, you can leave a plate of food outside or in your kitchen, and by the morning, the plate will have been found by an Ant! If you leave a window or door open, the plate will also be visited by a fly, guaranteed. Flies also come with the danger of laying eggs around any food that has been left out. Another great reason to clean up any leftover food. You don't want to wake up to some maggots on your kitchen floor!