An excellent recovery. Re the status of races of Rock Pipit in the county. This is a very complex subspecific problem, with no constant characters by which littoralis or petrosus can be identified during the winter. Williamson in 1965 stated that autumn petrosus had a purer olive mantle, and a brighter, pale yellow belly than littoralis, and whereas years ago, I thought that I could discern these features when comparing some birds, I now realise just how subjective this can be and doubt the validity of the separation of the races when not in breeding plumage.
In earlier years, it was often assumed that winter visitors to the east coast were largely British birds as there was a paucity of good littoralis birds identified. Witherby in the Handbook thought that littoralis probably constituted at least some of the birds which passed along the east coast, but he could quote only five definite records between Northumberland and Kent. We now know from ringing records that British birds are fairly resident, and with modern knowledge, it seems that most, if not all, of our Lincolnshire birds are littoralis.
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