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Video analysis of the escape flight of Pileated Woodpecker Dryocopus pileatus: does the Ivory-billed Woodpecker Campephilus principalis persist in continental North America?
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Correspondence: J Martin Collinson m.collinson@abdn.ac.uk
BMC Biology 2007, 5:8 doi:10.1186/1741-7007-5-8