Eustreptospondylus and Ammonite

S1 E4: Andy Day travels back in time to the era of the ammonites, which inhabited Earth 149 million years ago. They were a type of mollusc that lived in shoals in the sea. Andy is challenge to find a shell to replace the one he broke at the museum, and along the way he comes face to face with the eustreptospondylus - a swimming dinosaur.