The scorpion fly is a small insect with an average wing length of 50 millimeters (2 in). Due to the organ in its abdomen resembling a scorpion"s stinger, it is nicknamed the "scorpion fly". The fossil pictured is 125 million years old. Scorpion flies of 125 million years ago are no different from those alive today. This clearly shows that like all other living creatures, scorpion flies have not evolved.