13990881 - Many sharks have a third eyelid or nictitating membrane to cover and protect their eyes. Whale sharks (Rhiniodon typus) eyes,on the other hand,roll back into their head for protection as pictured here. This is the worlds largest species of fish,Donsol,Philippines70464571 - Fish roll on binoculars, Dierhagen, Fischland-Darss-Zingst, Baltic Sea, Mecklenburg-Vorpommern, Germany11329304 - A fish roll with smoked halibut, Ahrenshoop70464606 - Fish Roll with salmon, Polchow, Mecklenburg-Vorpommern, Germany70525521 - Roll with fried fish, Lubeck, Schleswig-Holstein, Germany