The term 'Fishy Feature' is composed of two words, 'FIN' and 'GILL'. A FIN is a thin appendage found on the sides of fish that helps them to move through the water. Fins also provide stability and help the fish to steer. Gills are organs located on the sides of a fish's head that allow it to breathe underwater. Gills extract oxygen from the water and expel carbon dioxide. Together, fins and gills are essential features of fish anatomy that enable them to survive in their aquatic environment.