They're Ants That Collect Skulls. Now We Know How And Why.

For 60 years, scientists observing Formica archboldi, a species of ant native to Florida, have documented something...odd. The ants' underground nests are littered with skulls and other body parts, primarily of Odontomachus, trap-jaw ants. Trap-jaws are formidable predatory badasses. F. archboldi are not. So what's going on? A new study sorts out the mystery — but discovers an even bigger oddity.
Of the 15,000 or so ant species out there, relatively few are prey specialists. Although