The carnivorous "bone collector" caterpillar is the only known species of its kind, researchers say, and its ancient lineage may soon die out.

Adorned in their macabre attire, the caterpillars can safely navigate spiderwebs undetected. They use their camouflage to feed on trapped prey: both living and freshly dead. Bone collectors will target and kill weakened or slow-moving insects, even hunting and cannibalizing their own kind. In each spiderweb, there can only be one.