Today whilst enjoying my stroll across the Downs, I came across a very unusual character. The picture may not look much to you, but what you are looking at is a rare beetle called the Oil Beetle.
They have been around for over 100 million years alongside the rise of flowers and bees. This matters because their life cycle is tightly linked to bees. As bees diversified, so did oil beetles. Their unusual strategy. Larvae hitching rides on bees to reach nests. has remained largely unchanged for millions of years.
Oil beetles are in decline across the UK. They rely on unimproved grassland, particularly chalk downland, and have declined over time due to habitat loss and the loss of solitary bee populations. Other species within the group are far rarer, with some now classed as nationally scarce or threatened and confined to very specific habitats.
They are not something you will see, even in good countryside. Many people spend years outdoors without ever noticing one. When you do see an oil beetle, it signals a high quality ecosystem with active bees. On the Wiltshire Downs, sightings are infrequent but meaningful, which is why conservation groups actively record every encounter.
Should you see one please do the following:
- Do not touch it. Oil beetles release cantharidin, which can blister skin.
- Record the sighting with schemes like Buglife or iRecord. These records matter and help track decline
- Do not try to “help” it relocate.
If you are seeing them regularly, then you are in a very rare ecosystem. The priority is simple. Keep the system intact.
