Sharks

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.

Holidaymaker spots ‘two crocodiles’ off UK coastline Andrew Quinn

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

Sharks and seahorses are now living in the River Thames Rhona Shennan

The sharks were discovered off the coast of New Zealand (Photo: Shutterstock)

Sharks that glow in the dark have been found off the coast of New Zealand Claire Schofield

Swim with sharks or jump off Japan's highest bridge on thrilling holidays Gay Bolton