8 August 2014 Last updated at 11:30
By David Miller
BBC Scotland environment correspondent
Scientists are building up a photographic database of the rare and endangered natterjack toad, in a bid to ensure its survival in Scotland.
They are relying on each toad's unique pattern of warts to enable them to identify individual animals.
That information will then be used by researchers monitoring whether the population rises or falls in the coming years.
The work is being carried out along the Solway Firth.
The toads can be found on sand dunes and in salt marshes known as merse.
The scientists search the area after dark, using torchlight to find the natterjacks.
The toads are then measured and photographed.
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