Night Swimming

Just as many staid adults were once rebellious teenagers in interesting clothing, many marine fish species enter life as flamboyant larvae that bear little resemblance to their mature forms. The juvenile scalloped ribbonfish pictured here, for example, eventually loses its flowing fin rays and grows into a teardrop-shaped adult that can reach over a meter long.

Or take the ribbon a quarter of the length of its body, and later becomes a with an underbite full of snaggled needle teeth. Still others have like a second tail or offer that they shed with time.