The ribbon eel has a unique appearance: trumpet like nostrils and a lower jaw with three tentacles. But even more amazing than this eel’s physiology is its signature behavior—a propensity for sex change. Functioning males regularly become females and change colors as well, adopting a nearly yellow hue that apparently suits their more feminine side. **** The Bornella anguilla, growing up to 80mm. It has a very characteristic mosaic-like color pattern. Its name [anguilla = eel] refers to its method of swimming. While most species of Bornella can swim by a lateral flexion of their body, in B. anguilla a muscular wave travels down the body to produce an eel-like motion. The B. anguilla has eyes, however they are only capable of discerning light and darkness.