A tourist has captured exciting footage of a basking shark swimming around a harbour in Cornwall.<br /><br />Olga Bates, 46, was visiting St Ives with family when she saw the large creature during high tide on the morning of Wednesday 23 March.<br /><br />Experts say it was a basking shark - the second largest type behind the whale shark - that can grow up to 45ft.<br /><br />They are relatively harmless to humans, with many in UK waters feeding on plankton and small crustaceans.
