These frightening monsters were actually dragonflies, found in both Britain and America. They existed 300 million years ago, and were referred to as the “Queen of the Carboniferous Skies,” and had an impressive wingspan of up to 65cm. To put it into perspective, a one foot wingspan is about the size of an Eagle. Millions of years ago, we would’ve found these now extinct animals across the globe. You wouldn’t want one of them to spot you, as they would dive down from the sky and snatch you off the ground – dead or alive (Walking With Dinos).