Marine Life - Hawai'i Volcanoes National Park (U.S. National Park Service) The rocky Puna coastline (NPS Photo/A. LaValle) Underneath their shell, ʻopihi have a single large suction-cup-like foot that they use to both move around and to cling to the rocks they call home, feeding on algae that gathers there. Two of the three species that are endemic to Hawaiʻi can be found within Hawaiʻi Volcanoes National Park. ʻĀlinalina (yellow-footed ʻopihi) tend to reside below the tide line. The other species, makaiauli (black-footed ʻopihi), are most often found higher, where the crashing of waves is not as constant.