Bone-house, 4-8 inches long

Crawling over rocks and flitting through tidal pools were many and varied crustaceans, copepods, wood lice, shrimp, crabs, crayfish and countless others. Most were familiar species, but Skull Island had its oddballs too, not least among them the chunky hermit crab Osteodomus. Large for a hermit, the biggest individuals had difficulty locating shells of sufficient size to fit. Innovative little opportunists, they made use of anything that even vaguely fit the bill, including hollowed bones, giving the species its name. It was not uncommon to see a seal skull scuttling over the rocks with spiky legs protruding.