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Three great whites are spotted in the waters off Oahu, but another one could be lurking just below the surface.

Numerous reports of giant great hammerhead sharks, up to twenty feet in length, have put the actual size potential of this species into question. A team of scientists from Florida International University is now on an expedition off the Florida coast to try and find the world’s biggest hammerhead, taking them from the numerous bridges of the Florida Keys to the sharky waters of the Bahamas.

Actress Natalie Portman and renowned animal expert Jack Hanna delve deep into the rain forests of central Africa in search of the legendary and endangered mountain gorilla. With compelling footage of the gorillas in their jungle home, this episode of Animal Planet's Emmy Award-winning "Saving a Species" series is a striking and sobering assessment of the habits and habitats of one of the world's most fascinating animals.