Once you’ve found an area of water where otters are about, it’s simply patience and a good eye that leads to a sighting. Otters can look remarkably like rocks until they move. When swimming on the surface, they leave a V shaped wake and they dive for no more than about 30 seconds. Sometimes they will surface at exactly the same spot but on other occasions they cover unexpected distances and you need to scan the water for the next sighting. These European otters were fishing in the waters of Loch Na Keal on the Hebridean island of Mull, a very good place to spot these particular mustelids. Our following trip to Arran revealed more on its coastline but they didn’t prove to be quite so accommodating for the photographer.