Scalloped hammerhead shark, Sphyrna lewini, swimming above a reef. Cocos Island, Pacific Ocean, Costa Rica. Greg Lecoeur, ...

With a bulging head that looks like it swallowed a gavel, there's no mistaking the animal: It’s a hammerhead shark. Across the globe, there are more than nine hammerhead species, many of which are ...

Bertie heads to Mexico to track the dangerous migration of one of the ocean’s most iconic predators: the hammerhead shark in ...

Gregory discusses visiting the Baja Peninsula, the shark fishing trade, and his new Act 4 Wildlife initiative.

One of the ocean’s most iconic predators appeared out of the blue. Mark Vins captures an unforgettable encounter with a giant ...

Hammerhead Sharks Up Close With Bertie Gregory, the National Geographic on the ocean’s most intriguing creatures, airs ...

"Hammerhead Sharks Up Close With Bertie Gregory" kicks off Sharkfest with a look at the rare species.