These Skull-Collecting Ants Are Way More Metal Than You

I am the punishment of God. Photo credit: Adrian Smith

Katie Spalding 19 Nov 2018, 16:44

When ancient cultures wanted to strike terror into their enemies, they knew exactly how to do it. Tales of Celtic tribes decapitating their foes and displaying the heads on spikes and nails spread through the Roman Empire like wildfire. It sent a clear message – “don’t mess with us.”

We may never know how exactly these ancient Europeans got their predilection for head-hunting. But had they lived in Florida, they might have got their inspiration from the local insect population.

Formica archboldi looks like a fairly boring ant. They’re not particularly big, or brightly colored, and they’ve been more or less ignored since they were originally described in 1958. But in a state where giant alligators roam golf courses and invade backyards, zombie warnings are a real thing, and the randomized mania of Florida Man is ever-present, Formica archboldi somehow manages to be the most badass creature around.

See, there’s something strange about F. archboldi. Their nests are littered with the decapitated heads of trap-jaw ants – a fearsome predator with a powerful sting and one of the fastest bites ever recorded.

“Add 'skull-collecting ant' to the list of strange creatures in Florida,” said Adrian Smith, head of the Evolutionary Biology & Behavior Lab at the North Carolina Museum of Natural Sciences. And his research, published this week in the journal Insectes Sociaux, explains just how these miniature barbarians are able to take on the trap-jaws so successfully.

In a set of gladiator-style battles, Smith put F. archboldi face-to-face with various trap-jaw species and filmed the ensuing fight. To see what was so unique about F. archboldi’s tactics, this trial by combat was also faced by F. pallidefulva – a fellow Formica species, but one without a history of somehow butchering predators much deadlier than itself.

Like most ants, F. archboldi can spray formic acid at its enemies as a defense mechanism – a sprayed trap-jaw will be immediately disabled, unable to walk or stand. But compared to its Formica brethren, archboldi’s acid isn’t particularly strong – so the ant instead relies on much more refined tactics to take down its foe.

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