The largest insects that ever lived were dragonfly-like bugs of the order Protodonata, sometimes referred to as griffinflies. They had wingspans of nearly 2.5 feet across and huge mandibles, making them formidable predators.
Thankfully, they went extinct a long time ago at the end of the Paleozoic Era. Although insects can't grow quite that large in today's world, there are a few that are nevertheless large enough to give even seasoned entomologists a good fright.
Here's our list of 10 of the largest insects alive today. (Text: Bryan Nelson)