Encouraging signs but no woodpecker

Susan Milius

Birders searching a Louisiana forest this winter for the long-lost ivory-billed woodpecker heard a knock-knock and would dearly love to know who's there.

The ivory-billed woodpecker, with its 31-inch wingspan and 20-inch length, hasn't been documented in the United States since the 1940s, and observers haven't confirmed the existence of the Cuban subspecies since the 1980s. A particularly vivid report of a supposed sighting in 1999 inspired Zeiss Sports Optics to send an international team to comb Louisiana's Pearl River Wildlife Management Area and adjacent woodlands.

After a month-long search, the team's final report on Feb. 20 says it hadn't found conclusive proof that the species still exists, but it had hopeful signs. On Jan. 27 at 3:30 p.m., four members of the team heard a loud knocking, as if a huge woodpecker were drumming on a tree. Pileated woodpeckers up to 17 inches long abound in the area, but none of the team had ever heard one hammer out the pattern, which featured paired knocks. Cornell University ornithologists had also heard paired knocks in the area.

That patch of forest—the team will not disclose the location—looks like good woodpecker habitat, the searchers say. They found cavities in trees and bald spots in bark that might have been big enough to represent ivory-billed woodpecker work.

Now, hope rests with the Cornell researchers, who have left 12 recording devices in the woods.

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References:

2002. The 30-day Zeiss search for the ivory-billed woodpecker ends. Carl Zeiss Sports Optics news release. Feb. 20.

Further Readings:

Additional information about the Zeiss-sponsored search in Lousiana for the ivory-billed woodpecker can be found at http://www.museum.lsu.edu/~Remsen/IBW.html. Information about earlier searches is available at http://www.birdingamerica.com/Ivorybill/ivorybilllinks.htm.

The Cornell Lab of Ornithology features the ivory-billed woodpecker at http://www.birds.cornell.edu/ivory/. This Web page includes a rare 1935 audio recording of the birds.

Sources:

Martjan Lammertink
U.v.A.—Zoological Museum
Bird and Mammal Department
Mauritskade 61
P.O. Box 94766
Amsterdam 1090GT
The Netherlands

J.V. Remsen
Museum of Natural Science
Foster Hall
Louisiana State University
Baton Rouge, LA 70803

Alison R. Styring
Museum of Natural Science
Foster Hall
Louisiana State University
Baton Rouge, LA 70803

From Science News, Volume 161, No. 9, March 2, 2002, p. 141.