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Both names seem to be correct for the same species. Most bird guides and the RSPB list the species simply as a Turnstone.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
In America you might need the Ruddy to distinguish from the Black Turnstone, but not in this country.
It is certainly not the accepted name as far as I am concerned!I have never heard anyone out birding say "There are ten Ruddy Turnstone on the rocks.", for example!
My Flickr photos...
Unfortunately iSpot seem to have Ruddy Turnstone as the default name for this species but we all know that there are a few errors that need correcting.
Of course, it is not the incorrect name, for official purposes, in these days of European Robins and Eurasian What-nots. I can see why it might be needed officially, but to correct Turnstone to Ruddy Turnstone is just daft!
Lat/Lng: 50.7, -1.6
OS grid ref: SZ3091