Common dolphins were once rare in the Hebrides , preferring warmer water . But their numbers have risen by 68 per cent over the last 12 years . Scientists believe this could be due to the waters warming by around 0.5°C . Hebridean Whale and Dolphin Trust is recruiting volunteers for monitoring .
Common dolphins were once rare in the Hebrides , preferring warmer water . But their numbers have risen by 68 per cent over the last 12 years . Scientists believe this could be due to the waters warming by 0.5°C . Hebridean Whale and Dolphin Trust is recruiting volunteers for monitoring .