Large school of white tip reef sharks that patrol the coral reef at night to hunt in Cocos Island National Park. - stock photo

Sharks in Cocos island, Costa Rica, night dive, Manuelita dive, Pacific Ocean. The oceanic whitetip shark (Carcharhinus longimanus), also known as Brown Milbert's sand bar shark, brown shark, nigano shark, oceanic white-tipped whaler, and silvertip shark, is a large pelagic requiem shark inhabiting tropical and warm temperate seas. Its stocky body is most notable for its long, white-tipped, rounded fins.