Imperial Woodpecker
(Campephilus imperialis)

The Imperial Woodpecker is officially listed as Critically Endangered (possibly extinct) by the IUCN. However, the last confirmed report was of a recently-shot bird in Durango in 1956 and the species is probably now extinct. The primary reason for its decline was loss of habitat, although the decline was also accelerated by over-hunting for use in folk medicine and because nestlings were considered a delicacy at least by the Tarahumara. Imperial Woodpeckers were stunning birds and as the species became rare many were apparently shot by people who had never encountered such a bird and wanted to get a closer look (Lammertink et al, 1996).
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Imperial Woodpecker - Wikipedia, the free encyclopedia

Old Friend Missing
Is the larger, grander cousin of our Ivory-billed Woodpecker - the Imperial Woodpecker - still flying in western Mexico?
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Birder's World - Species Profile: Imperial Woodpecker -

This species suffered from loss of habitat, many were killed for medicinal purposes.
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Endangered Species - Imperial Woodpecker Facts

The imperial woodpecker’s decline has occurred largely through the loss of its habitat, mainly the deforestation and clearance of the old growth pine and oak woods, researchers said.
The birds require areas as large as 26 square kilometers (10 square miles) of continuous open and untouched pine forest for each woodpecker pair, with dead trees for feeding and nesting.
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World’s Largest Woodpecker Believed Extinct

Breeding
Between February and June with clutches of 1-2 eggs. Young probably stay with parents until next nesting season.
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Imperial Woodpecker

The last definitive sightings of imperial woodpeckers were in the mid-1950s, with some scattered reports through the mid-1990s but none by experts. Even if a bird or two still survives, it seems inevitable the species will go extinct. If, as the recent sighting suggests, a few North American ivory-bills are still pecking for grubs in the forests of the southeastern U.S., there is a chance for the species to rebound. Their forest habitats have recovered somewhat and large blocks of forest are now protected. In contrast, there are no protected areas in what scraps remain of the imperial woodpecker’s Mexican habitat.
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Spotlight on Zoo Science: Barcodes for Ivory-billed Woodpeckers - National Zoo| FONZ