You've probably heard that Dippy the Diplodocus has disappeared from the entrance hall of the Natural History Museum now. He's been replaced by a swooping skeleton of a whale, who dives down at you from the roof.
The Natural History Museum also has an exhibition about whales called Beneath The Surface, all about the extraordinary life of whales, dolphins and porpoises.
You'll travel back 50 million years to the beginning of their evolution and learn how they've adapted to their underwater environments. You'll also see how similar they to us -- they are very sociable animals, and can communicate over vast distances.
It includes more than 100 specimens from the museum's collection, from the bones of a blue whale down to a tiny harbour porpoise.
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