The scorpion fly: a menacing name with a ‘romantic’ side.

Scorpion fly © Amy Lewis

The scorpion fly: an insect with a name that might get one’s imagination racing, even more so when seen flying around. A flying scorpion fly, with a wasp-like yellow and black body and a beak projecting out its head, might sound and look like the stuff of our worst nightmares. Fortunately, the scorpion fly is in fact not a scorpion, nor does it sting!

The scorpion fly is a fascinating-looking insect. It is around 3cm in length, and has a long, beak-like projection from its head which is uses to feed, typically on scavenged, dead insects, including stolen contents from spiders’ webs. It is typically found in gardens and hedgerows, and along woodland edges, particularly among stinging nettles and bramble.

With a scorpion-like tail, it is not hard to imagine where the scorpion fly got its name from. The curled-up tail is used by the males in courtship displays. If the tail wagging is successful, the loved-up scorpion flies will usually mate after dark. However, this affection is only stretched so thin as the mating process is a dangerous game for the male, often resulting in its death. To improve his chances of survival, the male scorpion fly will present the female with a gift, usually a dead insect or a mass of saliva will be enough to placate her: the insect equivalent of a box of chocolates.

Female scorpion fly on a large green leaf

Female scorpion fly ©Kayleigh Ghiot

The scorpion fly belongs to an ancient order of insects known as 'Mecoptera' which includes around 550 species worldwide. Mecoptera can be traced back to the Permian period, which was more than 250 million years ago, and are likely ancestors of butterflies and flies.

 

Many have evolved to mimic much more dangerous animals. For example, wasps and poisonous caterpillars developed yellow and black stripes as a warning sign to potential predators that they can cause them trouble. The scorpion fly has mimicked these markings, along with the likes of the ‘Batman’ hoverfly or the hornet hoverfly.