A rare Hawaiian caterpillar builds a macabre carapace from insect remains, using it to avoid predators and highlighting the hidden complexity of insect life.
Carnivorous caterpillar found in Hawaii
A newly discovered carnivorous caterpillar in Hawaii has been observed using insect remains to build a unique, mobile carapace, possibly to avoid predators. The caterpillar, which resembles a collection of insect parts, was first spotted over twenty years ago by entomologist Daniel Rubinoff of the University of Hawaii at Manoa.Caterpillar's unusual feeding and building habits
The caterpillars feed on weakened or recently dead insects, often found in spider webs, decaying wood, or rock crevices. After eating, they attach pieces of the remains to their bodies using silk, creating a distinctive, mobile armor that sets them apart from other Hyposmocoma caterpillars, which use pebbles or lichen instead.Rare carnivorous behavior in caterpillars
Carnivory is extremely rare among caterpillars, with nearly all moths and butterflies feeding on plants or fungi. However, this species appears to carefully select and adjust pieces of insect remains to construct its carapace, a behavior researchers suggest may help it blend in and avoid becoming prey.Species is rare and geographically limited
Rubinoff's team collected only sixty-two specimens over twenty-two years, indicating the species is uncommon. The caterpillars are found only on O'ahu, within a 15-square-kilometer area on a single mountain range, raising concerns about their vulnerability to environmental changes.Evolutionary history of the caterpillar
The bone collector caterpillar is believed to have originated six million years ago, before the island of O'ahu formed three million years ago. This suggests the species must have migrated from an older Hawaiian island, and its lack of close relatives on other islands indicates possible extinctions of related species.Hawaii's role in species evolution
Hawaii's isolation has allowed for the evolution of many unique species, including other Hyposmocoma caterpillars that live in water or use lichen for decoration. The discovery of the bone collector caterpillar highlights the diversity within the genus and the possibility of more undiscovered species.Caterpillars transform into elegant butterflies
These caterpillars eventually turn into butterflies with wings marked by white fringes. Their unusual, macabre lifestyle reveals the complexity and variety of insect development, a phase often overlooked in favor of their more familiar adult forms.
