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Sharks

<p>Holidaymaker Sarah Craven believes she saw two crocodiles off the coast of Yorkshire - this is a still image taken from the video shared on Facebook.</p>

Read This Holidaymaker spots ‘two crocodiles’ off UK coastline

The Thames had been declared 'biologically dead' in 1957 (Photo: Dan Kitwood/Getty Images)

Read This Sharks and seahorses are now living in the River Thames