The Japanese Bullhead Shark is a somewhat-small species of shark found in rocky areas.
"This shark has a large head and distinctive ridges above its eyes that look like cat ears or cow horns. It lies still in reef crevices or on the seafloor during the day then sets out to look for food at night. It preys mainly on molluscs and crustaceans, using its gigantic teeth to crush and eat them.
Spiral clumps of a strange black material about 15cm long are sometimes found on the seafloor. These are the eggs of the Japanese bullhead shark. They are worth seeing as they have such a unique shape that the first people to find them could not believe they were eggs. There is a reason for this spiral shape: it makes it easy for the eggs to be snagged in rocks or embedded in sand and more difficult for it to be carried away by the currents."
Adults can be seen all year round in the Rock Land area.
The adults swim about in slow circles on the sand, and respond positively to food and being petted. The juveniles act the same way, but confined to their resident zoom-mode glows, and the eggs sit there and do nothing (as eggs have a tendency to do).