Bright and breezy, the westerly gusts possessed a cool razor's edge. Scapa Bay wasn't as sheltered as it would be from a southerly wind, but this didn't stop a huge flock of gulls from gathering far out in the middle. A few grebes and auks could be picked out from this throng, though they were difficult to identify to species at distance. Closer to or on the shore, were assorted Redshanks, Guillemots and Black-headed Gulls, the latter not actually sporting black feathers on its head, more a dull brown. The scientific name for Black-headed Gull, Chroicocephalus ridibundus , translates as 'coloured head laughing', so rather unhelpfully not a direct reference to which colour, and the laughing referring to its call. Oddly, and this is often the case with gull nomenclature, there is a species known as Laughing Gull, whose scientific name is Leucophaeus ( or Larus) atricilla , translating as 'white/brown blacktail', without any reference to laughing at all. It...