If staying on Mull, a visit to the Treshnish Isles, and Lunga in particular, is an absolute 'must'. We went in hot sunny weather. As we arrived, most of the Auks were on the water, and when we landed there were very few on land. However, they all came in off the sea about half an hour later. It is an absolutely magical spectacle to see the large colonies of sea-birds here.