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

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

Sharks and seahorses are now living in the River Thames

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

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