African Big-Headed Ants in Bermuda: Why They're Different and How to Get Rid of Them
Updated: Oct 8
If you've noticed unusually small ants around your home, accompanied by the occasional much larger ant with an oversized head, chances are you're dealing with African big-headed ants.
These invasive ants have become widespread across the island and are now one of the more challenging ant species for homeowners to control. Unlike many common household ants, African big-headed ants behave differently, build larger colonies, and often require a completely different treatment strategy to eliminate them successfully.
How to Identify African Big-Headed Ants
One of the easiest ways to identify this species is by looking at the workers.
Most of the ants you'll see are very small, but mixed among them are much larger "soldier" ants with noticeably oversized heads and powerful jaws. Those distinctive heads are exactly how they earned their name.
If you're seeing ants of two different sizes travelling together, there's a good chance you're looking at African big-headed ants.
Why They're Such a Problem in Bermuda
African big-headed ants thrive in Bermuda's warm, humid climate.They prefer dark, damp areas and commonly nest:
Around foundations
Under paving stones and patios
In gardens and flower beds
Around pipes and utility lines
Beneath rocks and landscaping
From these outdoor nests, they can easily find their way into homes through tiny cracks and gaps.
What makes them particularly troublesome is their ability to create extensive colonies with multiple queens and establish new nests through a process known as budding. Their larger soldier ants have incredibly strong mandibles that allow them to chew through materials such as:
Caulking
Grout
Soft mortar
Some stone and building materials
This enables the colony to expand into wall voids, bathrooms, kitchens and other hidden spaces throughout the home.
Unlike many other ant species, African big-headed ants often have multiple queens, allowing colonies to grow rapidly and making them much harder to eliminate with conventional treatments.
Why Spraying Often Makes the Problem Worse
When homeowners first notice ants, it's natural to reach for an insecticide spray. While spraying may kill the ants you can see, it usually doesn't reach the colony hidden behind walls or underground.
In fact, with African big-headed ants, heavy use of residual insecticides can actually make the problem worse.
When part of the colony is disturbed, it may splinter, breaking into multiple smaller colonies that spread to new areas around the property. Instead of solving the problem, the infestation can become larger and more difficult to control over time.
Eco Pest's Approach
Because African big-headed ants behave differently, we treat them differently.
We’ve introduced highly effective internal and external baiting options specifically suited to these ants. Rather than relying solely on residual insecticides, our technicians focus on a carefully planned baiting program, placing specialized ant baits both inside and outside your home.
The worker ants collect the bait and carry it back to the colony, where it is shared with other workers, larvae and, most importantly, the queens.
By targeting the colony itself instead of just the visible ants, we're able to achieve far more effective, long-term control.
What to Expect During Treatment
One thing we always prepare our clients for is patience.
After bait is placed, it's common to see an increase in ant activity during the first week or two. While this may seem alarming, it's often a positive sign.
The ants are recruiting more workers to the bait source and transporting it back through the colony. This increased activity is an important part of the elimination process and usually subsides as the colony declines.
Our goal isn't simply to eliminate the ants you can see today—it's to eliminate the colony that's producing them.
How You Can Help
To get the best results from treatment:
Avoid spraying over bait placements.
Leave bait undisturbed so the ants can continue feeding.
Keep food preparation areas clean to reduce competing food sources.
Let your Eco Pest technician know if you notice new areas of activity.
Following these recommendations gives the bait the best chance of reaching the entire colony.
Don't Let the Colony Grow
African big-headed ants are one of Bermuda's most persistent invasive ant species, but with the right treatment strategy, they can be effectively managed.
If you've noticed large-headed "soldier" ants around your property or you're dealing with recurring ant problems that never seem to go away, Eco Pest can help.
Our technicians understand the unique behaviour of African big-headed ants and use treatment methods designed to target the colony—not just the ants you happen to see.
Think you have African big-headed ants? Contact Eco Pest today to schedule an inspection and let us help you take control of the problem.
