If you're looking for alternative names for the sea hedgehog, you might consider the word "sea urchin". This is actually the more common name for these spiny creatures, and it describes their spherical shape and prickly exterior. Other synonyms could include "urchin", "spiny urchin", or "hard-shelled sea creature". Depending on where you're from, you might also hear them called "kina" or "wana". Whatever you call them, these fascinating creatures can be found throughout the world's oceans and play an important role in many marine ecosystems. Whether you're a diver, a scientist, or just a curious beachcomber, learning more about sea hedgehogs can be a fascinating and rewarding pursuit.