Knowing your hornets

Knowing your hornets

Worcestershire Wildlife Trust is encouraging Worcestershire residents to become familiar with the differences between the county’s native hornet and the non-native Asian hornet.

The Asian, or yellow-legged hornet, has become established in mainland Europe and the Government’s National Bee Unit have been finding, identifying and destroying nests found in southern England since 2016 to prevent the insect becoming established in the UK. Of the 120 total sightings to date, most were in 2023 when 72 nests were destroyed.

So far in 2024, there have been 19 sightings and these have all been restricted to London, East Sussex and Kent. However, it is important that people across the country remain vigilant and report any sightings.

Steve Bloomfield, senior conservation officer at Worcestershire Wildlife Trust, explained “Asian hornets feed their young on invertebrates so the arrival of this non-native species to the UK poses a threat to our pollinators and other species. We’re one of the most nature-depleted countries in the world so it’s important to do what we can to help protect our beleaguered wildlife.

“Britain’s wildlife has evolved side-by-side with our native hornets for centuries but the arrival of Asian hornets, whose populations are able to expand more rapidly than those of our native hornets, pose a real threat.

“Our native hornets are rather docile gentle giants, unlikely to sting humans unless really threatened. Whilst Asian hornets won’t go out of their way to sting us, they are more aggressive than our native species. It’s really important that people understand the difference between the two so that they don’t inadvertently persecute the former and do report the latter.”

Annotated image of an Asian hornet with identification features labelled

Asian hornet by Sarah Bunker 'The Yellow-legged Asian Hornet - A Handbook'

Asian hornets are between 2.5cm and 3cm long, which is a little smaller than a native hornet but bigger than wasps. They are very dark with dark brown or black heads and bodies with just a segment of orangey-yellow towards the end of their abdomen. Their legs are black at the top and bright yellow from about halfway down.

Side view of a hornet sitting on a dark leaf by Wendy Carter

Hornet by Wendy Carter

In contrast, European hornets have a much more chestnut colouring with an orangey head, chestnut thorax and an abdomen that is orangey-yellow and black striped. Their legs are dark.

Anyone who thinks they may have found an Asian hornet can visit the Trust's know your hornets webpage to see photographs of both species to help with identification.

As well as mistaking native hornets for Asian hornets, there are a number of other insects that mimic hornets and wasps. Worcestershire Wildlife Trust would encourage people to take a photo of anything they think is an Asian hornet rather than kill it.

The team at the Trust is keen to hear from people who spot native hornets and other insects through their Wildlife Sightings scheme, which aims to map the locations of Worcestershire’s amazing wildlife.

Reports of Asian hornets should be sent via the Asian Hornet Watch app or https://risc.brc.ac.uk/alert.php?species=asian_hornet