The hornet hoverfly, the UK’s largest hoverfly at 2cm, is so good at imitating our native hornet that it can trick both people and hornets into believing that it is one. Both species have a deep buzz in flight, a yellow head, a dark orange-red thorax (the area just behind their head) and stripes across their abdomen.

Key features differentiate the two species, however. Hornet hoverflies have a broad body and large, round eyes, whilst hornets have a narrower middle and smaller eyes. In addition, hornets have two pairs of wings whereas hoverflies, like all flies, have one pair.

Once a rare species in Worcestershire, in recent years numbers of hornet hoverflies have increased. These flies can be spotted across Worcestershire throughout summer and into early autumn.

Nick Packham, senior engagement officer at the Trust, commented “In flight, hornet hoverflies can fool even the most experienced of naturalists into thinking that they are hornets.

“Their disguise doesn’t just stop at their appearance; by camouflaging their scent, female hornet hoverflies sneak into the nests of hornets and social wasps to lay eggs. The larvae later feed on debris in the nest. It’s a fantastic example of how different species support each other and the complexity of the insect world.

“Sadly, however, many people are intolerant of insects, particularly of wasps and hornets that can sting if provoked. We’re eager to change these negative perceptions and to encourage an appreciation for these small creatures.

“With 41% of insects facing extinction, it’s vital that we take action to support them by stopping the use of pesticides and leaving lawns, hedgerows and verges a bit wilder.”

Mimicry is common in the natural world. By imitating species that are more dangerous for a predator to tackle, an insect is less likely to be preyed upon. Hornet hoverflies are unable to sting and although they can sting, the UK’s native hornets are generally considered to be rather docile, only stinging when left with no choice.

Anyone who sees a hornet hoverfly should take a photo or video footage and upload it via the Trust's wildlife sightings webpage.

Individuals can learn more about helping insects in their gardens and local greenspaces by visiting Worcestershire Wildlife Trust’s action for insects webpage.