Wēkiu bugs feed on dead insect carcasses that drift up Mauna Kea on the wind and settle on snow banks. This is a highly unusual food source for a species in the genus Nysius, which consists of predominantly seed-eating insects. They can survive at extreme elevations of up to because of natural antifreeze in their blood. They also stay under heated surfaces most of the time. Their conservation status is unclear, but the species is no longer a candidate for the Endangered Species List; studies on the welfare of the species began in 1980. The closely related Nysius aa lives on Mauna Loa. Wolf spiders (Lycosidae) and forest tent caterpillar moths have also been observed in the same Mauna Kea ecosystem; the former survive by hiding under heat-absorbing rocks, and the latter through cold-resistant chemicals in their bodies.