What it could be argued has been the best-ever autumn for rarities in Britain and Ireland continued to produce throughout October, with highlights from the east as well as the west. Transatlantic lows settled down into a more mundane mix of slow-moving low-pressure systems and occasional westerly blasts, which were then followed by a late run of easterlies generated by a settled high between Iceland and Fennoscandia.
It is perhaps surprising, then, that the rarest bird of October arrived from the south, with Britain’s first Western Olivaceous Warbler in Shetland at Skibberhoull, Whalsay, on 20-21st (see pages 9-10). Disappointingly for British twitchers, however, the identity of this subtle Iduna didn’t become clear until its day of departure. This species, which is a breeding visitor to North Africa and Iberia, has…
