VIDEO: Why the common dolphin is becoming more common

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Why the common dolphin are increasingly

May 28, 2015 at 08:26 clock updates BST

Despite its name, the common dolphin was once a rare sight in the waters off the west coast of Scotland, but now their number is increasing.

Marine scientists are trying to figure out why dolphins are thriving in the Hebrides.

The BBC John Maguire joined a scientific study in order to learn more.

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