The very distinctive Zebra Shark (Stegostoma fasciatum) cannot be confused with any other animal. It has a tail second in proportional length only to the Thresher Shark. Hard ridges run down the back and flanks. The head is short and rounded with small eyes and a mouth close to the tip of the snout. The dark brown to black juveniles with yellowish white bars and spots gives this shark its common name. As it grows to adulthood the bars are replaced by a mosaic of dark brown spots on a yellowish to dark brown base colour; this coloration gives rise to its other common name, Leopard Shark.