: an act of showing someone how something is used or done : demonstration. 1  I saw a demo on how to use the computer program. 2  The salesman gave us a demo of the vacuum cleaner, and it seemed to work very well. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples 3
If however, you are talking about some maggots in a bowl of wet food (either canned food or dry food which got wet or which you deliberately added fluid to) it is a different matter. Maggots come from flies eggs and they take some set period of time to hatch from the eggs.
How to Prevent Flies (and Maggots) 1  Always clean up any food and don't leave any sitting out. Store food in sealed containers. 2  Flies will lay their eggs in your petâs food as well, so make sure you change their food fully and donât just top it up. Keep the dish covered when not in use. 3  Clean out garbage cans thoroughly.