The following Sun. (3/26) post, "IBWO vs. PIWO Wing" by Floyd Hayes on "Frontiers of Identification" is one of many I think worth a read, if you're not already following them all on that site:
http://birdingonthe.net/mailinglists/FRID.html#1143399287
Several good, and balanced points are made I think, and toward the end this reasonable conclusion is included:
"In my opinion the current IBWO controversy is by far the greatest--and most entertaining--bird controversy
in my lifetime. Whether or not it is ever resolved to the satisfaction of all, just think of how much we have learned thus far and
yet have to learn about: the appearance, biology, and historical occurrence of the IBWO; the mechanics of bird flight, including
variation in the wingbeat frequencies of woodpeckers; variation in the vocalizations of woodpeckers and other birds including
Blue Jays; variation in the drumming displays of woodpeckers and other sources of similar sounds; the limitations of video
and sound analysis; etc. Of course we also benefit by the new acquisitions of land and funding for conservation, and
the education of the general public."
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