For instance, at one point there was a huge species of dragonfly that doesen't exist any longer. Insect distribution is affected by climate changes of the past. It is believed, that when ice ages began, some insects fled to the equator, while others, better adapted stayed behind in the cold. Then the earth warmed up again, became a mild place, and the cold weather insects retreated to the last truly cold places like mountain tops. A perfect example of this is that a rare cold weather butterfly occurs in only two places in the world, Pikes Peak Colorado, and Mount Washington, New Hampshire.
Insects are the most populous group of animals on the Earth.
Everyone is affected by their presence. Who hasn't been bitten by a mosquito, or found bugs in their room, or discovered ants eating away at crumbs n their kitchen. The insects presence is most keenly felt during the summer. Insects, seem to disappear during the winter. Entomologists know that they will return next spring as they always do.