We're learning that some groups of whales and dolphins have their own dialects, diets and routines – cultural differences once thought to be unique to humans. 

With extraordinary photography of behaviour rarely captured before, journey inside the underwater communities of whales. From beluga to orca, sperm whales to humpbacks, this globe-spanning story documents the quest to decode the intelligence of the world's largest mammals.

The May edition of National Geographic magazine is the Oceans Issue. Also this month: 

Saving coral scientists are scrambling to save our most endangered reefs
Beneath the Mediterranean 28 days in a diving bell beneath a sea travelled for millenia
Robert Ballard A life of discovery beneath the waves, from Titanic to Earhart

Plus:

The scars of mining
Yo-Yo Ma
Wandering rocks

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