Deep in the forests of Oʻahu, Hawaii, there’s a tiny, bizarre creature that would fit right into a horror movie — a caterpillar that hunts bugs, wears their bodies, and sneaks around inside spider webs. Scientists have named it the “bone collector,” and it might just be one of the strangest species ever discovered.
Living within a tiny six-square-mile patch of forest, this rare carnivorous caterpillar belongs to the Hyposmocoma genus, a group already famous for strange behaviors. But the bone collector takes weirdness to a whole new level.
Instead of hiding in bark or leaves like normal caterpillars, it builds a camouflage suit out of dead insect parts and spider remains. Then it camps out on spider webs, snatching prey right under the noses — or rather, the pedipalps — of its eight-legged landlords. Even wilder? Sometimes it helps itself to the spiders’ leftover meals.
Researchers, led by Dr. Daniel Rubinoff at the University of Hawaii at Mānoa, believe the caterpillar’s gruesome disguise tricks spiders into ignoring it. In fact, in hundreds of observations, spiders have never once attacked or eaten these creepy little guests.
“The array of dead insect bits and old spider skins might act like a cloak,” scientists explained in their new study. “The spiders just don’t seem to notice them.”
And if you think that’s wild, it gets even darker. In lab tests, the caterpillars showed cannibalistic tendencies, attacking and eating each other when given the chance. Apparently, when you’re a bone collector, anything slow enough to catch is fair game.
“It’s remarkable,” said Dr. David Wagner, an entomologist at the University of Connecticut who wasn’t involved with the study. “You’re tying your survival to a spider, which is normally a huge threat to insects.”
Finding these caterpillars isn’t easy. Since 2008, Dr. Rubinoff’s team has logged over 150 field surveys but found only 62 individuals. They seem to exist solely within a single mountain range in Oʻahu, clinging to survival on less than six square miles of forest.
Genetic studies reveal this creepy crawler split off from its carnivorous relatives over five million years ago — long before the island of Oʻahu even existed. Its ancestors likely lived on older Hawaiian islands before becoming isolated in the mountaintops where it survives today.
But its future looks uncertain. Invasive ants, parasitic wasps, and habitat loss from climate change are closing in fast. And because the bone collector relies on such a specific environment and set of behaviors, it’s especially vulnerable.
Scientists warn that without urgent conservation efforts, this one-of-a-kind, body-collecting caterpillar could vanish forever.
“Without conservation attention, it is likely that the last living representative of this carnivorous, body-part-collecting caterpillar lineage will disappear,” researchers wrote.
For now, the bone collector remains one of the world’s weirdest wonders — a tiny reminder of how strange, and fragile, nature can be.
Would you also like a second version that’s even a little more playful or spooky for comparison?