The crossword solutions for the term CHILD; SEA CREATURE is URCHIN. An URCHIN is a type of sea creature that belongs to the echinoderm family, which includes starfish and sea cucumbers. It has a spiny exterior and is usually found in shallow waters. Urchins are often referred to as 'sea hedgehogs' due to their spiny appearance. They are an important part of the marine ecosystem, providing food for many other sea creatures.