I have just read Lee’s page on the ‘Pacific Golden Plover’ in London http://uk400clubrarebirdalert.blogsp...r-pitches.html, with some images of it I had not seen. On it he writes on the ID of the bird: ‘an interesting individual with unusually excessive black on the lower underparts and flanks, but its long tibia, toe extension beyond the tail and relatively short primary extension beyond the exposed tertials, certainly implicate fulva, and most convincingly the fact that it is in such spanking and advanced breeding plumage (dominica AGP develops such summer attire several weeks later than its close counterpart, generally acquiring such feathering in the last week of May) (Lee G R Evans)’
I had not heard of this late moult as a feature to differentiate PGP and AGP in Spring and am not so sure it is correct. I did a very quick search and found these images of AGP in N America.
http://www.pbase.com/image/117163815 - 28th April
http://www.pbase.com/image/96540059 - 30th April
http://www.pbase.com/image/112737112 - 19th May
http://www.pbase.com/image/112820844 - 21st May
Further, he links the bird with that in the Netherlands http://www.lauwersmeer.com/php/fotog...l&landid=&add=, but I feel that there are differences, notably the amount of white on the head and flanks and exact covert pattern.