Iberian Ant Queen Laid an Egg. A Different Species Hatched.

A queen ant in Europe is laying eggs. Some hatch into her own kind. The rest hatch into a completely different species she has never been.

Scientists discovered that Iberian harvester ant queens (Messor ibericus) mate with males of a separate species, the builder harvester ant (Messor structor). Weird, but not unheard of. Here's where it goes off the rails: the M. ibericus queens store the M. structor male's sperm, then use it to fertilize eggs, and researchers believe the queens strip their own genetic material from those eggs' nuclei so that when they hatch, they produce M. structor male clones. She is not a vessel. She is a photocopier for someone else's genome.

The males from the same mother carry distinct genomes and body types, belonging to species that diverged more than 5 million years ago. Queens produce males of both M. ibericus and M. structor, while all worker ants in M. ibericus colonies are female hybrids of the two species.

The researchers needed a new word for it. They landed on "xenoparous," from xeno- meaning "foreign, strange or different" and -parous meaning "to give birth." This is the first known case in the animal kingdom of this occurring as part of an animal's regular life cycle.

The colony that cracked this open was found on the Italian island of Sicily, roughly 1,000 kilometers (621 miles) from the closest known M. structor population. No males nearby to mate with, yet the queen keeps producing their clones. Over generations, Iberian harvester ants developed the ability to maintain a lineage of cloned M. structor males entirely within their own nest, no geographic overlap required.

Confirming it in the lab took two years of monitoring 50 colonies without a single male being born. Then the team got lucky.

Biology has been running a basic rule: mothers make more of themselves. This ant didn't get the memo.

Read the full story at Smithsonian Magazine, September 8, 2025

Hot Take: Every biology textbook on earth has a line in it, somewhere, that says organisms reproduce their own kind. The textbook now needs a footnote that says "except Iberian harvester ants."