Sand tiger sharks, also known as gray nurse sharks ... Sand tigers are the only shark known to come to the surface and gulp air. They store the air in their stomachs, which allows them to float ...

OARAI, Ibaraki Prefecture--A sand tiger shark was born at the Aqua World Ibaraki Prefectural Oarai Aquarium here, the first successful breeding of the species in Japan. Only four other aquariums ...