Cockroaches That Eat Each Other’s Wings May Be the Insect World’s Most Committed Partners
Most love stories don’t start with mutual wing consumption. But for one species of wood-eating cockroach found in Asia, devouring your partner’s wings is apparently the ultimate commitment ceremony — and new research suggests it may seal one of the rarest bonds in the insect world.
A study published in Royal Society Open Science reveals that Salganea taiwanensis cockroaches appear to form pair bonds — the kind of lasting, exclusive partnerships scientists typically associate with birds and mammals, not six-legged creatures. The ritual that kicks it off? Easily the strangest courtship behavior you’ve never heard of.
What Pair Bonding Really Means for Cockroaches
Pair bonding “just means that two individual organisms will spend an extended period of time with each other and will exclude other individuals from the bond,” says Nate Lo, an evolutionary biologist at the University of Sydney and an author of the new study, per NPR. “The two individuals know that the other member has their back.”
In the animal kingdom, pair bonding can bring real advantages — shared food, grooming and better protection of the nest and offspring. It’s well-documented in vertebrates like penguins, wolves and certain primates. Finding it in an insect is what makes this discovery stand out.
“But we very rarely see it in invertebrates, so things like insects or crustaceans or other creepy crawlies,” says Lo.
How Salganea Taiwanensis Cockroaches Seal the Deal With Wing-Eating
The process starts when a male and female cockroach find a piece of decaying wood. “The male and the female will burrow into the rotting wood and form a little gallery,” Lo explained.
Then things get intense. Over the course of a few hours, the two roaches chew off each other’s wings and eat them. The “female eat[s] the male’s wings and the male eats [the] female’s wings,” says Haruka Osaki, a behavioral ecologist at the Museum of Nature and Human Activities in Hyogo, Japan. And when this one-time meal is complete, “it means they formed a pair.”
Only after the wing-eating ritual do the roaches begin nesting and mating.
“The wings, they’re a protein source,” explains Lo, “and this seems to set them up for some kind of romance into the future.”
These are wood-feeding insects that survive on decaying wood — a tough, low-nutrient food source. About 20 percent of their wood-digesting enzyme activity happens in the hindgut, often with help from symbiotic microbes that break down cellulose.
The Okinawa Experiment That Tested the Cockroach Bond
Researchers wanted to understand what the wing-eating actually signified, so they observed a group of roaches from Okinawa. Osaki described the collection method with characteristic bluntness: “Just go to forest and find a log on the ground and chop it with my hatchet. So I destroy their house.”
The team paired off roaches and placed them in artificial nest boxes. Not all pairs ate each other’s wings. Then researchers introduced an intruder to each pair — and the results split sharply.
Roaches that still had their wings showed no aggression toward the intruder. But the pairs that had consumed each other’s wings went on the offensive.
“Both the male and the female attack,” Lo said. “They also wiggle their butts and hit them with their butts. They’re quite aggressive little creatures.”
Lo said the intruder was “very worried” and was “trying to escape.”
“So that suggests they don’t want to have a third wheel. It’s like they’ve got this pact,” he continued.
What This Cockroach Discovery Means for Understanding Insect Intelligence
This partner-specific tolerance, combined with aggression toward outsiders, could strengthen cooperation and reduce competition — a survival advantage researchers hadn’t expected from creatures with such small brains.
“Invertebrates probably are more complex and have some form of cognition, more than we might expect,” says Lo. “Even though they’ve got tiny brains, they can develop quite human-like characteristics.”
Lo also notes that bonded pairs had spent an extra 24 hours together before the experiment — during which they ate each other’s wings — compared to pairs that hadn’t bonded. However, he says, “We’re not sure about how important that is,” and adds that more experiments are planned.
Somewhere in a rotting log in Okinawa, two wingless roaches are guarding their nest together, bumping intruders with their butts. Science is just now catching up to their love story.
This article was created by content specialists using various tools, including AI.
