The Canary Islands are sheltered by a mild climate, protected from any extremes of weather. But high up on the towering mountains, the conditions can turn treacherous. In winter, water is released by high altitude storms and fertilized by nutrients washed from the soil. As this drains into the sea the soupy waters around the islands attract a huge variety of life, draw in in from the vast Atlantic Ocean. Many whale and dolphin species congregate in these waters, but above all Short-finned pilot whales are found here in the vast numbers.Isora is the leader and matriarch of one of the largest resident pilot whale pods between Tenerife and La Gomera and we document her activities over a one year period.