Add Yahoo as a preferred source to see more of our stories on Google. Just a blue whale's tongue weighs as much as an adult elephant. But what caused blue whales to grow to such an extraordinary size?

Add Yahoo as a preferred source to see more of our stories on Google. PHOTO: An undated stock photo of a blue whale. (Stock Photo/Getty Images) One of nature's most awe-inspiring creatures, the rare ...

Only two blue whale births have ever been recorded in human history, both decades ago. This remains an extraordinary mystery, given there used to be hundreds of thousands of blue whales before whaling ...

The sound of the blue whale’s singing has decreased off the coast of California, frightening scientists who believe it is an indication of greater ecosystem danger. Scientists tracked the auditory ...

Beside a quiet pond in Oklahoma, an enormous blue whale rises from the grass, and travellers have been stopping to admire it ...

Endangered pygmy blue whales dive to depths in the ocean to forage and feed along their migratory path off the Western Australian coast, new research led by the Australian Institute of Marine Science ...

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Blue whales hold the title of the world's largest animals, even out-sizing most dinosaurs. Learn just how massive these marine giants are and what threats they face today. The blue whale is renowned ...