Crevice created by eroded canal stonework not quite right as potential nesting site for returning Sand Martins

Suitable nesting sides are often hard to find for returning Sand Martins, so fingers crossed in their quest for three birds that, earlier this week, were prospecting a wall of the Caledonian canal near Fort William in northern Scotland. One bird briefly tried out a crevice for size and comfort, but it did not  seem right, so the martins moved on.