Fossil experts in Cambridgeshire have uncovered the remains of a prehistoric fish - which is 160 million years old and 30 metres long.
It was found in a quarry near Peterborough. It's thought it could be a completely new type of a certain fish called Leedsichthys problematicus.
The bones are now being picked over at Fossils Galore Museum in March in Cambridgeshire. As the fish is so large, they estimate it will take 10 years to go through the find bit by bit, to piece together how the fish would have looked all those years ago.
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