Does a house fly lay eggs or deposit larvae?

Question

Today I sprayed a house fly with Raid to kill it. It was on my living room wall, and it fell on a bookcase below. It was still wriggling a bit, but the strange thing was the all these little worms started coming out of it and they were wriggling all around the fly. I promptly sprayed it more and flushed all of the worms and the fly down the toilet.

I looked it up online, but I read that flies lay eggs and then they hatch. Why would the larvae come out of the fly?

Answer 1

Flies lay eggs, eggs hatch into larvae, they pupate and turn into adult flies.

  May be the flies had parasites of their own somehow.

There are many insects that parasitise other insects.

There is a wasp that will parasitise a fly, but I don't know if it is the adult or the maggot that the wasp parasites

Answer 2

Most flies do have complete (egg, larvae,pupa and adult) metamorphosis. But like many things in nature, there are always exceptions to the rule. Some species (Sarcophagidae) of flies are viviporous, hatch out/ birth live maggots. I suspect this is what you saw.  

Good question!

Answer 3

The house fly has a complete metamorphosis with distinct egg, larva or maggot, pupal and adult stages. The house fly overwinters in either the larval or pupal stage under manure piles or in other protected locations. Warm summer conditions are generally optimum for the development of the house fly, and it can complete its life cycle in as little as seven to ten days. However, under suboptimal conditions the life cycle may require up to two months. As many as 10 to 12 generations may occur annually in temperate regions, while more than 20 generations may occur in subtropical and tropical regions.

What Fly Eggs Look Like

http://www.justbajan.com/health/articles...