The slap of an enormous tail upon grey waters as a humpback whale leaps from the sea is becoming an increasingly possible – although still rare – natural thrill around Britain. The 30-tonne, 15 metre-long migratory giants are being spotted in growing numbers and locations this winter from Kent to the Isles of Scilly. There have been 17 sightings of the whales around the Isles of Scilly between 29 December and 8 January this year. Several individuals spotted include one called Pi because of the distinctive markings on her fluke (the lobes of her tail), who has turned up for