If flies can’t survive during the winter, how do they come back each Summer?

Question

Do they hibernate their eggs or emigrate back up North?

In: Biology

Answer 1

Depends where you are. Relatively mild winters the flies might go dormant or lay eggs that stay dormant until spring. But in harsher areas like Canada most of the flies can’t survive even doing that, so they die off, but as soon as it’s warm enough new flies arrive typically among transported food.