Information about the Bird Ivory-billed Woodpecker
Despite published reports from Arkansas, Florida, and Louisiana and sporadic reports elsewhere in the historic range of the species since the 1940s, there is no conclusive evidence for the continued existence of the ivory-billed woodpecker; i.e., there are no unambiguous photographs, videos, specimens or DNA samples from feathers or feces of the ivory-billed woodpecker. Land acquisition and habitat restoration efforts have been initiated in certain areas where there is a relatively high probability that the species might survive to protect any possible surviving individuals.In late September 2006, a team of ornithologists from Auburn University and the University of Windsor published reports of their own sightings of ivory-billed woodpeckers along the Choctawhatchee River in northwest Florida, beginning in 2005. These reports were accompanied by evidence that the authors themselves considered suggestive for the existence of ivory-billed woodpeckers. Searches in this area of Florida through 2009 failed to produce definitive confirmation.An anonymous $10,000 reward was offered in June 2006 for information leading to the discovery of an ivory-billed woodpecker nest, roost or feeding site. In December 2008, the Nature Conservancy announced a reward of $50,000 to the person who can lead a project biologist to a living ivory-billed woodpecker.Reports of at least one male ivory-billed woodpecker in Arkansas in 2004 were investigated and subsequently published in April 2005 by a team led by the Cornell Lab of Ornithology. No definitive confirmation of those reports emerged, despite intensive searching over five years following the initial sightings.The species is listed as critically endangered and possibly extinct by the International Union for Conservation of Nature (IUCN). The American Birding Association (ABA) lists the ivory-billed woodpecker as a Class 6 species, a category the ABA defines as "definitely or probably extinct."The ivory-billed woodpecker (Campephilus principalis) is one of the largest woodpeckers in the world, at roughly 20inches (51cm) in length and 30inches (76cm) in wingspan. It is native to the virgin forests of the southeastern United States (along with a separate subspecies native to Cuba). Because of habitat destruction and, to a lesser extent, hunting, its numbers have dwindled to the point where it is uncertain whether any remain, though there have been reports that it has been seen again. Almost no forests today can maintain an ivory-billed woodpecker population.
Ivory-billed woodpecker is the common name of several species of woodpecker distinguished by having a bill that resembles ivory:
The Ivory-billed woodpecker is the type species for the genus Campephilus, a group of large American woodpeckers. Although the Ivory-billed looks very similar to the pileated woodpeckers they are not close relatives as the pileated is a member of the genus Dryocopus.
Ornithologists have traditionally recognized two subspecies of this bird: the American Ivory-billed, the more famous of the two, and the Cuban ivory-billed woodpecker. The two look similar despite differences in size and plumage. There is some controversy over whether the Cuban ivory-billed woodpecker is more appropriately recognized as a separate species. A recent study compared DNA samples taken from specimens of both ivory-billed birds along with the imperial woodpecker, a larger but otherwise very similar bird. It concluded not only that the Cuban and American Ivory-billed woodpeckers are genetically distinct, but also that they and the imperial form a North American clade within Campephilus that appeared in the Mid-Pleistocene. The study does not attempt to define a lineage linking the three birds, though it does imply that the Cuban bird is more closely related to the imperial.
The American Ornithologists' Union Committee on Classification and Nomenclature has said it is not yet ready to list the American and Cuban as separate species. Lovette, a member of the committee, said that more testing is needed to support that change, but concluded that "These results will likely initiate an interesting debate on how we should classify these birds." Before this study, it was thought that the Cuban Ivory-billed were descended from mainland woodpeckers, either introduced to Cuba by Native Americans or accidentals that flew to the island themselves.
While recent evidence suggesting that American ivory-billed woodpeckers still exist in the wild has caused excitement in the ornithology community, no similar evidence exists for the Cuban Ivory-billed bird, believed to be extinct since the last sighting in the late 1980s.
The ivory-billed woodpecker ranks among the largest woodpeckers in the world and is the largest in the United States. The closely related and likewise possibly extinct imperial woodpecker (C. imperialis) of western Mexico is, or was, the largest woodpecker. The Ivory-billed has a total length of 48 to 53cm (19 to 21in) and, based on very scant information, weighs about 450 to 570g (0.99 to 1.26lb). It has a typical 76cm (30in) wingspan. Standard measurements attained included a wing chord length of 23.5-26.5cm (9.3-10.4in), a tail length of 14-17cm (5.5-6.7in), a bill length of 5.8-7.3cm (2.3-2.9in) and a tarsus length of 4-4.6cm (1.6-1.8in).
The bird is shiny blue-black with white markings on its neck and back and extensive white on the trailing edge of both the upper- and underwing. The underwing is also white along its forward edge, resulting in a black line running along the middle of the underwing, expanding to more extensive black at the wingtip. In adults, the bill is ivory in color, chalky white in juveniles. Ivory-bills have a prominent crest, although in juveniles it is ragged. The crest is black in juveniles and females. In males, the crest is black along its forward edge, changing abruptly to red on the side and rear. The chin of an ivory-bill is black. When perched with the wings folded, ivory-bills of both sexes present a large patch of white on the lower back, roughly triangular in shape. These characteristics distinguish it from the smaller and darker-billed pileated woodpecker. The pileated normally is brownish-black, smoky, or slaty black in color. It also has a white neck stripe but the back is normally black. Pileated juveniles and adults have a red crest and a white chin. Pileateds normally have no white on the trailing edges of their wings and when perched normally show only a small patch of white on each side of the body near the edge of the wing. However, pileated woodpeckers, apparently aberrant individuals, have been reported with white trailing edges on the wings, forming a white triangular patch on the lower back when perched. Like all woodpeckers, the ivory-bill has a strong and straight bill and a long, mobile, hard-tipped, barbed tongue. Among North American woodpeckers, the ivory-bill is unique in having a bill whose tip is quite flattened laterally, shaped much like a beveled wood chisel.
The bird's drum is a single or double rap. Four fairly distinct calls are reported in the literature and two were recorded in the 1930s. The most common, a kent or hant, sounds like a toy trumpet often repeated in series. When the bird is disturbed, the pitch of the kent note rises, it is repeated more frequently, and is often doubled. A conversational call, also recorded, is given between individuals at the nest, and has been described as kent-kent-kent. A recording of the bird, made by Arthur A. Allen, can be found here.
The ivory-billed woodpecker is sometimes referred to as the Grail Bird, the Lord God Bird, or the Good God Bird, all based on the exclamations of awed onlookers. Other nicknames for the bird are King of the Woodpeckers and Elvis in Feathers.
Ivory-billeds are known to prefer thick hardwood swamps and pine forests, with large amounts of dead and decaying trees. Prior to the American Civil War, much of the Southern United States was covered in vast tracts of primeval hardwood forests that were suitable as habitat for the bird. At that time, the ivory-billed woodpecker ranged from east Texas to North Carolina, and from southern Illinois to Florida and Cuba. After the Civil War, the timber industry deforested millions of acres in the South, leaving only sparse isolated tracts of suitable habitat.
The ivory-billed woodpecker feeds mainly on the larvae of wood-boring beetles, but also eats seeds, fruit, and other insects. The bird uses its enormous white bill to hammer, wedge, and peel the bark off dead trees to find the insects. These birds need about 25km2 (9.7sqmi) per pair so they can find enough food to feed their young and themselves. Hence they occur at low densities even in healthy populations. The more common pileated woodpecker may compete for food with this species.
The ivory-billed woodpecker is thought to pair for life. Pairs are also known to travel together. These paired birds will mate every year between January and May. Both parents work together to excavate a nest in a dead or partially dead tree about 8-15m from the ground before they have their young. Nest openings are typically ovular to rectangular in shape, and measure about 12-14cm tall by 10cm wide (4"-5 3/4" by 4")
Usually two to five eggs are laid and incubated for 3 to 5 weeks. Parents incubate the eggs cooperatively, with the male incubating from approximately 4:30 PM-6:30 AM while the female foraged, and vice versa from 6:30 AM-4:30 PM. They feed the chicks for months. Young learn to fly about seven to eight weeks after hatching. The parents will continue feeding them for another two months. The family will eventually split up in late fall or early winter.
Ornithologists speculate that they may live as long as 30 years.
Heavy logging activity exacerbated by hunting by collectors devastated the population of ivory-billed woodpeckers in the late 19th century. It was generally considered extinct in the 1920s when a pair turned up in Florida, only to be shot for specimens.
In 1932, a Louisiana state representative, Mason Spencer of Tallulah, disproved premature reports of the demise of the species when, armed with a gun and a hunting permit, he killed an ivory-billed woodpecker along the Tensas River and took the specimen to his state wildlife office in Baton Rouge.
By 1938, an estimated twenty woodpeckers remained in the wild, some six to eight of which were in the old-growth forest called the Singer Tract, owned by the Singer Sewing Company in Madison Parish in northeastern Louisiana, where logging rights were held by the Chicago Mill and Lumber Company. The company brushed aside pleas from four Southern governors and the National Audubon Society that the tract be publicly purchased and set aside as a reserve. By 1944, the last known ivory-billed woodpecker, a female, was gone from the cut-over tract.
The first audio and only motion picture recording made of the ivory-billed woodpecker was created as part of a 1935 study by a group of Cornell scientists in the Singer Tract in Madison Parish, Louisiana. The ivory-billed woodpecker was listed as an endangered species on 11 March 1967, though the only evidence of its existence at the time was a possible recording of its call made in East Texas. The last reported sighting of the Cuban subspecies (C. p. bairdii), after a long interval, was in 1987; it has not been seen since. The Cuban Exile journalist and author John O'Donnell-Rosales, who was born in the area of Cuba with the last confirmed sightings, reported sightings near the Alabama coastal delta in 1994, but these were never properly[clarification needed] investigated by state wildlife officials.
Two tantalizing photos were given to Louisiana State University museum director George Lowery in 1971 by a source who wished to remain anonymous but who came forward in 2005 as outdoorsman Fielding Lewis.
The photos, taken with a cheap Instamatic camera, show what appears to be a male Ivory-billed perched on the trunks of two trees in the Atchafalaya Basin of Louisiana. The bird's distinctive bill is not visible in either photo and the photos- taken from a distance- are very grainy. Lowery presented the photos at the 1971 annual meeting of the American Ornithologists Union. Skeptics dismissed the photos as frauds; seeing that the bird is in roughly the same position in both photos, they suggested they may have been of a mounted specimen.
There were numerous unconfirmed reports of the bird, but many ornithologists believed the species had been wiped out completely, and it was assessed as "extinct" by the International Union for Conservation of Nature and Natural Resources in 1994. This assessment was later altered to "critically endangered" on the grounds that the species could still be extant.
In 1999, there was an unconfirmed sighting of a pair of birds in the Pearl River region of southeast Louisiana by a forestry student, David Kulivan, which some experts considered very compelling. In a 2002 expedition in the forests, swamps, and bayous of the Pearl River Wildlife Management Area by LSU, biologists spent 30 days searching for the bird.
In the afternoon of 27 January 2002, after ten days, a rapping sound similar to the "double knock" made by the ivory-billed woodpecker was heard and recorded. The exact source of the sound was not found because of the swampy terrain, but signs of active woodpeckers were found (i.e., scaled bark and large tree cavities). The expedition was inconclusive, however, as it was determined that the recorded sounds were likely gunshot echoes rather than the distinctive double rap of the ivory-billed woodpecker.
A group of seventeen authors headed by the Cornell Lab of Ornithology (CLO) reported the discovery of at least one ivory-billed woodpecker, a male, in the Big Woods area of Arkansas in 2004 and 2005, publishing the report in the journal Science on 28 April 2005.
One of the authors, who was kayaking in the Cache River National Wildlife Refuge, Monroe County, Arkansas, on 11 February 2004, reported on a website the sighting of an unusually large red-crested woodpecker. This report led to more intensive searches in the area and in the White River National Wildlife Refuge, undertaken in secrecy for fear of a stampede of bird-watchers, by experienced observers over the next fourteen months. About fifteen sightings occurred during the period (seven of which were considered compelling enough to mention in the scientific article), possibly all of the same bird. One of these more reliable sightings was on 27 February 2004. Bobby Harrison of Huntsville, Alabama and Tim Gallagher of Ithaca, New York, both reported seeing an ivory-billed woodpecker at the same time. The secrecy of the search permitted The Nature Conservancy and Cornell University to quietly buy up Ivory-billed habitat to add to the 120,000 acres (490km2) of the Big Woods protected by the Conservancy.
A large woodpecker was videotaped on 25 April 2004; its size, wing pattern at rest and in flight, and white plumage on its back between the wings were cited as evidence that the woodpecker sighted was an ivory-billed woodpecker. That same video included an earlier image of what was suggested to be such a bird perching on a Water Tupelo (Nyssa aquatica).
The report also notes that drumming consistent with that of ivory-billed woodpecker had been heard in the region. It describes the potential for a thinly distributed population in the area, though no birds have been located away from the primary site.
In the fall of 2006, researchers developed and installed an "autonomous observatory" using robotic video cameras with image processing software that detects and records high resolution video of birds in flight inside a high probability zone in the Cache River area. As of August 2007, hundreds of birds have been recorded, including pileated woodpeckers, but not the ivory-billed woodpecker.
In June 2005, ornithologists at Yale University, the University of Kansas, and Florida Gulf Coast University prepared a scientific paper skeptical of the initial reports of rediscovery.
The paper was not published. Questions about the evidence for ivory-billed woodpecker persisted. The CLO authors could not say with absolute certainty that the sounds recorded in Arkansas were made by Ivory-bills. Some skeptics, including Richard Prum, believe the video could have been of a pileated woodpecker.
An article by Dina Cappiello in the Houston Chronicle published 18 December 2005 presented Richard Prum's position as follows:
The American Birding Association largely stayed out of the debate. On page 13 of Winging It (November/December 2005), a brief reference was made:
In a Perspectives in Ornithology commentary published in The Auk in January 2006, ornithologist Jerome Jackson detailed his skepticism of the Ivory-bill evidence:
Fitzpatrick and co-authors responded with a lengthy piece in the same scientific journal, protesting Jackson's harsh language, dismissive tone, "factual errors," and "poorly substantiated opinions" about the original paper. One of the most rancorous debates in the history of ornithology had begun in earnest. The two sides each published additional responses that seemed, to many ornithological observers, to have departed markedly from accepted scientific decorum. Jackson accused the Fitzpatrick team of "untruths", and Fitzpatrick accused Jackson of obviating the normal peer-review system with an opinion piece "treated as a scientific contribution by the public media."
In March 2006, a team headed by David A. Sibley of Concord, MA published a response in the journal Science, asserting that the videotape was most likely of a pileated woodpecker, with mistakes having been made in the interpretation of its posture. They conclude that it lacked certain features of an ivory-billed woodpecker, and had others consistent with the pileated; they asserted positively that the blurry video images belonged to pileated woodpecker. The CLO team responded in the same issue of Science, standing by their original findings, stating:
Other workers made claims disputing the validity of the Luneau video, including a web site discussing the evidence by Colby College biologist Louis Bevier, who stated:
A 2007 paper concluded that the Luneau video was consistent with the pileated woodpecker:
Doubt was also cast on some of the auditory evidence (ARU recordings of double-raps) for the presence of ivory-billed woodpeckers in Arkansas and Florida. One group of researchers stated:
Cornell-organized searches in Arkansas and elsewhere from 2005 to 2008 did not produce any new photographic evidence of the species. The press release summarizing the 2005-6 search season stated:
It is interesting to note that, despite his harsh criticism of the 2005 evidence, Jerome A. Jackson agrees with the value of additional searches. In May 2006, it was announced that a large search effort led by the Cornell team had been suspended for the season with only a handful of unconfirmed, fleeting sightings to report. At that point, conservation officers allowed the public back into areas of the Cache River National Wildlife Refuge that had been restricted upon the initial reported sightings. The 2006-07 search season had similar results to those of the previous year:
Likewise, the 2007-08 search season did not deliver conclusive evidence of the bird:
Cornell University did not field a search team in Arkansas during 2008-2009, but focused on mangrove habitats in southwest Florida, with a later visit planned for South Carolina. According to a Cornell University press release from January 2009, the 2008-09 season will be the last Cornell-sponsored search, absent confirmation of the bird:
The 2008-09 search effort in southwest Florida found no evidence of the bird:
In October 2009, Cornell scientists announced that their search for the ivory-billed woodpecker in North America was being suspended. As of February 2010, the Cornell researchers concluded there was no hope of saving the bird, if it still exists:
In September 2006, new claims that the ivory-billed woodpecker may not be extinct were released by a research group consisting of members from Auburn University in Alabama and the University of Windsor in Ontario. Dr. Geoffrey E. Hill of Auburn University and Dr. Daniel Mennill of the University of Windsor have revealed a collection of evidence that the birds may still exist in the cypress swamps of the Florida panhandle. Their evidence includes 14 sightings of the birds and 300 recordings of sounds that can be attributed to the ivory-billed woodpecker, but also includes tell-tale foraging signs and appropriately sized tree nest cavities (Hill et al., 2006). This evidence remains inconclusive as it excludes the photographic or DNA evidence that many experts cite as necessary before the presence of the species can be confirmed. While Dr. Hill and Dr. Mennill are themselves convinced of the bird's existence in Florida, they are quick to acknowledge that they have not yet conclusively proven the species' existence. The research team is currently undertaking a more complete survey of the Choctawhatchee River, in hopes of obtaining photographic evidence of the bird's existence. In March 2007 the Florida Ornithological Society Records Committee voted unanimously not to accept the 2005-06 reports of the ivory-billed woodpecker on the Choctawhatchee River:
The Auburn/University of Windsor team continued search efforts but planned to cease updates on their web site in August 2009:
An analysis of videos obtained in the Pearl River in Louisiana in 2006 and 2008 during encounters with birds that were identified in the field as ivory-billed woodpeckers was published in 2011 along with comments by independent experts. Bret Tobalske, an ornithologist who specializes in the flight mechanics of woodpeckers, performed an analysis of wing motion and concluded that the bird in the 2008 video is a large woodpecker. Only two large woodpeckers occur north of the Rio Grande, but the flap rate is about ten standard deviations greater than the mean flap rate of the pileated woodpecker. The flight speed, narrow wings, and prominent white patches on the dorsal surfaces of the wings are also consistent with ivory-billed but not pileated woodpecker. Avian artist Julie Zickefoose analyzed the 2006 video and commented on the "rared-back pose, long but fluffy and squared-off crest, and extremely long, erect head and neck" and an unusual short flight that does not seem to be consistent with a pileated woodpecker. A size comparison was carried out using part of the tree in which the bird in the 2006 video was perched. Two prominent forks made it possible to scale frames from the video relative to a photo of a pileated woodpecker specimen that was mounted on the tree. On the basis of the comparison, it is clear that the bird in the video is a large woodpecker, and the size appears to be consistent with an ivory-billed woodpecker. A series of lectures discuss the videos and a set of factors that affect the difficulty of detecting and photographing ivory-billed woodpeckers. Two of the factors, the vast size of the habitats that must be searched and dense vegetation that limits visibility, are evident in video footage that was obtained using a drone over the Pearl, Choctawhatchee, and Apalachicola Rivers.
In economically struggling east Arkansas, the speculation of a possible return of the Ivory-bill has served as a great source of economic exploitation, with tourist spending up 30%, primarily in and around the city of Brinkley, Arkansas. A woodpecker "festival", a woodpecker hairstyle (a sort of mohawk with red, white, and black dye), and an "Ivory-bill Burger" (made with 100% beef) have been featured locally. The lack of confirmed proof of the bird's existence, and the extremely small chance of actually seeing the bird even if it does exist (especially since the exact locations of the reported sightings are still guarded), have prevented the explosion in tourism some locals had anticipated.
Ivorybills have also been featured in "Skink, No Surrender" by Carl Hiaasen as a clue to where the protagonist's cousin can be found, for Ivorybills could only be found in one place in the world. Since the cousin was kidnapped and could not tell the people who were trying to find her where she was, she gave an implicit hint that she saw an Ivorybill, telling her finders, where she was.
Brinkley hosted "The Call of the Ivory-billed Woodpecker Celebration" in February 2006. The celebration included exhibits, birding tours, educational presentations, a vendor market, and more.
Interviews with residents of Brinkley, Arkansas, heard on National Public Radio following the reported rediscovery were shared with musician Sufjan Stevens, who used the material to write a song titled "The Lord God Bird".
Arkansas has made license plates featuring a graphic of an Ivory-billed Woodpecker.
More inforamtion about Ivory-billed Woodpecker.