Incredible footage shows dolphin family swimming alongside tourist boat in Cornwall

This is the wonderful moment a mother and calf common dolphin play in the waters alongside a tourist boat, in Cornwall. The spectacular and heart-warming moment is said to have made guides 'want to cry'. Common dolphins are most commonly found on the south and west coasts of the UK. They are exceptionally playful mammals and can travel up to speeds of 30mph when chasing a boat or food.