What newly discovered caterpillar species was named the 'Bone Collector' in 2025 for its unique camouflage using prey remains?

A newly identified caterpillar species, aptly nicknamed the "Bone Collector," garnered attention in 2025 for its truly macabre yet ingenious method of camouflage. This remarkable insect constructs a portable silk case adorned with the skeletal remains and body parts of its prey, creating an outfit that helps it blend into its unusual habitat. Discovered by researchers in Hawaii, this unique behavior is a testament to the diverse and often surprising adaptations found in the natural world.

What makes the "Bone Collector" particularly fascinating is its carnivorous diet, a rarity among caterpillars, with only about 0.1 percent of known moth and butterfly species exhibiting this trait. This Hawaiian species lives in a precarious environment, making its home within spider webs found in tree hollows, rock crevices, and fallen logs. By decorating its silk case with the exoskeletons and limbs of other insects, including those caught in spider webs, the caterpillar effectively disguises itself as mere detritus, often fooling the very spiders whose webs it inhabits and whose prey it scavenges. This allows it to feed on weakened or dead insects without being perceived as a threat by the spiders.

Researchers have observed these caterpillars meticulously selecting and attaching various insect parts, such as fly wings, weevil heads, and spider legs, to their cases. Despite its recent discovery and bizarre lifestyle, this lineage of caterpillars is ancient, with origins dating back at least six million years, predating the current Hawaiian islands themselves. Unfortunately, the "Bone Collector" is already considered endangered, found only in a small, isolated area of O'ahu, highlighting the urgent need for conservation efforts to protect this extraordinary species.