: 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.
Housefly, or Musca domestica, maggots are the kind most commonly seen in homes. During the summer, houseflies look for suitable places, such as rotten food and fecal matter, to lay their eggs. These eggs can take up to 24 hours to hatch. The maggots that hatch from them look like small cream or pale yellow grains of rice.