Guide to the Green Ant: Appearance, Location, and First Aid for Bites
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For anyone spending time outdoors in Australia’s tropical north, the green ant is nearly impossible to avoid. While they may seem harmless, and they will be to most people, like all other ants there’s more to them than meets the eye. What you don’t know about green ants might change your experiences next time you encounter one out in the bush.
What Is the Green Ant?
Green ants (Oecophylla smaragdina) are native Australian insects also known as the weaver ant or green tree ant. Workers are orange or reddish-brown in body colour, while their large rear section is a bright green.
Green ants are scavengers and predators. They hunt small insects and spiders, drag animal material back to their nest, and can overpower small vertebrates when foraging. They also harvest honeydew from scale insects in the tree canopy.
Green Ant Distribution and Habitat
In Australia, the green ant is found across tropical coastal areas from Broome in Western Australia, across the Northern Territory, and down the Queensland coast to Yeppoon. Their range extends through tropical Asia and across the Pacific Islands.
Green tree ants are arboreal, meaning they live in trees. Their activity peaks during the wet season (November to April).
Identifying a Green Ant Nest
A green ant nest is recognisable as a cluster of folded or curled leaves in a tree, with ants crawling across the surface. Nests are built primarily in the canopy but can also be found lower in shrubs and vegetation.
A single colony can span more than one hundred nests across several trees and house up to half a million workers. Different nests serve different functions: some hold larvae and pupae at various stages, others shelter worker ants, and one will contain the queen and receive the heaviest defence. If a nest is disturbed, even by accidentally brushing against it, they may swarm out.
Green Ant Bites and First Aid
A green ant bite can be a two-part event. The ant grips the skin with its legs and mandibles, then it might spray acid from its abdomen. The burning sensation you feel comes from the acid mixing with the bite wound. A normal bite produces pain, redness, swelling, and sometimes a rash or hives; these usually resolve withun 24 hours, but can be treated by washing with soap and water.
A small number of people can experience anaphylaxis: a severe allergic reaction with symptoms that include difficulty breathing, swelling of the tongue or throat, dizziness, and a sudden drop in blood pressure. If the person bitten has difficulty breathing:
- Lay the person flat on their back.
- If they have a known green ant allergy they should have an adrenaline autoinjector (such as an EpiPen) for you to inject into the outer mid-thigh.
- Call triple zero (000) and ask for an ambulance.
- If symptoms have not improved after five minutes and the ambulance has not yet arrived, give a second dose of adrenaline.
Preventing Green Ant Bites
Green ant bites happen when ants defend a disturbed nest. Avoiding bites comes down to awareness and appropriate clothing.
Wear long-sleeved shirts, long pants, and closed shoes to reduce the area of exposed skin accessible to foraging ants. Tuck your pants into your socks for added coverage.
Apply insect repellent containing DEET to exposed skin before heading outdoors.
Be Ready for Bites Before You Head Outdoors
Green ants are a predictable part of outdoor life in northern Australia, and a bite you are prepared for is one you can manage. For people without an allergy, the reaction is uncomfortable but short-lived and easily treated. For anyone with severe allergies, being underprepared can turn a brief encounter into a genuine emergency.
First aid training prepares you for the encounter by teaching you to recognise allergic reactions and respond. If your next trip north takes you through the bush, enrolling in first aid training before you go could be the decision that protects someone you care about.
FAQs
Do Green Ants Bite or Sting?
Green ants bite and do not have a stinger at all.
Is A Green-Head Ant the Same as a Green Ant?
No. Green-head ants (Rhytidoponera metallica) are a separate Australian species, identified by a distinctive metallic green head and thorax that ranges in shade from green-blue to green-purple. Unlike green tree ants, which build their nests in trees, green-head ants nest in the soil beneath logs and stones or at the base of shrubs, and are found across most parts of Australia rather than just the tropical north.
Are Green Ant Bites Dangerous to People Without Allergies?
Generally, no. However, repeated green ant bites can increase a person’s sensitivity over time, meaning a reaction that seems mild early on may grow stronger.
