Here is an image from the Ivory-billed Woodpecker (Campephilus principalis) search result from Wolfram Alpha's computational knowledge search engine that details Campephilus taxonomy.
Taxonomic network:
http://www.wolframalpha.com/input/?i=ivory-billed+woodpecker
Source: Wolfram Alpha LLC. 2010. Wolfram|Alpha.
(accessed February 20, 2010).
By the way, if you've never entered your birth day, month and year into Wolfram Alpha, you may want to try it out here.
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