The best example of this is the monarch butterfly. In the spring the butterflies spread north again and reclaim their breeding grounds. A few insects are active year round, or only active during the winter months. The immature stages of many aquatic insects are able to remain active throughout the year. Most of these insects are equipped with special body fluids that act as antifreeze and prevent the insects from being harmed by the freezing temperatures.
Galls are a common sight on many plants, including weeds, shrubs and trees.
The insects and mites are the most common causes of plant galls. Insects responsible for gall formation include gall wasps, gall flies and midges, aphids, caterpillars, beetles and thrips. Many insects live inside of developing galls. These galls usually consist of two distinct layers - an outer protective layer and an inner nutritive layer. Through the process of evolutionary trial and error gall insects now feed at the proper rate so that they do not kill all of the developing plant tissue.