Nuthatch (Sitta europaea)
We don't get many Nuthatches on the feeders, despite the fact they breed a couple of hundred yards away as the Nuthatch flies. I love seeing them, OK I admit I love seeing any bird. I like the Nuthatches because as a boy they were a rare bird which you couldn't see in the county.
In the 1971 Breeding Bird Atlas they were recorded only about 6 times in the area which was to become Cumbria and breeding only at 3. By the time I was surveying for the 2007 to 2011 Atlas they were in all the Tetrads (2km x 2km square) and present and breeding in virtually every tetrad in the county.
Why have they expanded? I don't know, the only logical reason I can think of is climate change. In 1971 virtually all records were south of a line Dee Estuary (Wales) and the Humber. I doubt habitat has changed enough to account for the increase.