Bugs often eat cereals. These animals can also eat flour, maize, wheat, rice, lentils and breakfast foods. Bugs are normally found in dark places, for instance, in cupboards as this is where they cannot be seen easily.
1 Additional Answer
Different bugs eat different things. Some bugs eat the pollen or nectar of flowers, while others eat grass and leaves. There are bugs that eat other bugs, and bugs like the cockroach that will eat almost anything, including their own waste. You can find more information here: http://teacher.scholastic.com/activities/bugs/friz/index.asp