There are signs... amongst the day-to-day happenings, there are definitely signs. In Orkney, Autumn is not so much a season, it's the dawning realisation that birds you have been listening to or watching for several months are no longer there. Then, no sooner than that thought has flickered across your mind, the empty skies, fields and bays are filled with different species, a new palette of colours, sights and sounds. And, if you're a leaf, Autumn lasts about 24 hours. Plants don't tend to be sentimental, they can't afford to be. For them, Summer to Winter is like a switch being thrown. This week, many flocks of Pink-footed Geese winged their way south through the scudding Orcadian sky. Energetic V's of "Wink, wink" sounds battling the gusting breeze as they headed for estuaries far from the Arctic Circle. I saw my first Whooper Swans of the Winter, a group of a dozen, counter-intuitively flying north, but I think they were headed for St Peter's Pool ...