Why Achnasheen in the first place?

Achnasheen was chosen as the venue for Otterfest 08 not only because of its eminent suitability for a huge gathering (wide open spaces, legendarily fine weather, great road links to Garve and beyond, and of course Achnasheen Airport). We also chose it because of its symbolism in the history of the otter in the UK - Achnasheen was of course the location of the last recorded sighting of the Green Otter in the late nineteenth century. If anyone has any good background on the Green Otter, we'd love to hear from you. Wikipedia is definitely lacking in this department.