Blue Peter loves whales! Take this quiz and find out how much you know about these giant sea creatures... You'll have a whale ...

The idea of a battle between a megalodon and a blue whale captures the imagination, though these giants never shared the same oceans. The megalodon, an extinct apex predator, was equipped with ...

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?

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