Insects have been around for an incredibly long time. Scientists have found an imprint of a type of insect that lived over 300 million years ago. The insect was a dragonfly, and it looked very much like a dragonfly of today, except it was far larger. It had a wingspan of just under three feet. Dragonflies eat other insects, so it is a safe assumption that there were plenty of other insects alive at the time, to be preyed upon by this monstrosity.