It’s not easy being a bug, especially one as small as an ant.
The list of potential predators is lengthy for the diminutive creatures, so it’s no wonder they’ve developed an arsenal of defense mechanisms including painful bites, stings and overpowering enemies by sheer numbers.
But one newly discovered ant species goes above and beyond when it senses danger.
It explodes — killing itself — and coats adversaries in a toxic yellow goo, the ultimate act of self-sacrifice to protect its colony.
These valiant ants are the newest addition to the species group Colobopsis cylindrica, more colloquially known as “the exploding ants,” according to a detailed survey of the insects published Thursday in ZooKeys, a peer-reviewed open access scientific journal.
Found in the jungles of Southeast Asia, the tree-dwelling ants were called “Yellow Goo” before researchers aptly named them Colobopsis e xplodens, Alice Laciny, the article’s lead author, told The Washington Post.
They are the first new species of exploding ant to be discovered since 1935, Laciny said. The small reddish-brown ants look like any other ant.
But their bodies are full of glandular sacs containing a deadly fluid, said Laciny, an entomologist at the Natural History Museum in Vienna, as well as a PhD student at the University of Vienna. In the ant hierarchy, they are minor workers, a colony’s expendables.
But there’s nothing cinematic about the ants’ final act of heroism. “The explosion is not as dramatic as people think it is,” Laciny said.
Rather, the ants will bite down on the enemy, angle their backsides close and contract their muscles so hard their skin splits open, releasing the goo, Laciny said.
The sticky substance, which oddly has a “spice-like, curry-like” scent, then either kills the intruder or hinders its attack, she said.
Exploding behavior of the ant in an experimental setting with a weaver ant. (Alexey Kopchinskiy/Pensoft Publishers) If enemies survive the first line of defense, they will come face to face with the colony’s major workers and their enlarged, plug-shaped heads, researchers wrote.
Known as “doorkeepers,” these ants barricade the nest’s entrance, providing a second line of defense. Although exploding ants were first observed by scientists more than 100 years ago, not much was known about them, including how many different kinds existed.
In 2014, Laciny and a group of researchers — composed of entomologists, botanists, microbiologists and chemists from Austria, Thailand and Brunei — set out to document the exploding ants, according to a summary by the journal’s publisher.
The scientists determined there are at least 15 different kinds of these self-sacrificing insects, including this one.