(fulica americana)
The American Coot is a very rare vagrant in Scotland. To date there have been only four (possibly five) ocurrences of this bird in Scotland, two in England and two in Ireland. The bird photographed here had been present since early January and looked as if it was likely to remain on Loch Flemigton for a while.
Three identification differences separate the American Coot from our common Coot - the dark red knob on the forehead, the pale ring on the bill and (diagnostically) the white undertail.