
Environmental Encyclopedia 3
Ivory-billed woodpecker
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Ivory-billed woodpecker
The ivory-billed woodpecker (Campephilus principalis) is one
of the rarest birds in the world and is considered by most
authorities to be extinct in the United States. The last con-
firmed sighting of ivory-bills was in Cuba in 1987 or 1988.
Though never common, the ivory-billed woodpecker was
rarely seen in the United States after the first years of the
twentieth century. Some were seen in Louisiana in 1942,
and since then, occasional sightings have been unverified.
Interest in the bird rekindled in 1999, when a student at
Louisiana State University claimed to have seen a pair of
ivory-billed woodpeckers in a
wilderness
preserve. Teams
of scientists searched the area for two years. No ivory-billed
woodpecker was sighted, though some evidence made it
plausible the bird was in the vicinity. By mid-2002, the ivory-
billed woodpecker’s return from the brink of
extinction
remained a tantalizing possibility, but not an established fact.
The ivory-billed woodpecker was a huge bird, averag-
ing 19–20 in (48–50 cm) long, with a wingspan of over 30
in (76 cm). The ivory-colored bills of these birds were prized
as decorations by native Americans. The naturalist John
James Audubon found ivory-billed woodpecker in swampy
forest edges in Texas in the 1830s. But by the end of the
nineteenth century, the majority of the bird’s prime
habitat
had been destroyed by
logging
. Ivory-billed woodpeckers
required large tracts of land in the bottomland cypress, oak,
and black gum forests of the Southeast, where they fed off
insect larva in mature trees. This
species
was the largest
woodpecker in North America, and they preferred the largest
of these trees, the same ones targeted by timber companies
as the most profitable to harvest. The territory for breeding
pairs of ivory-billed woodpeckers consists of about three
square miles of undisturbed, swampy forest, and there was
little prime habitat left for them after 1900, for most of
these areas had been heavily logged. By the 1930s, one of
the only virgin cypress swamps left was the Singer Tract in
Louisiana, an 80,000-acre (32,375-ha) swathe of land owned
by the Singer Sewing Machine Company. In 1935 a team
of ornithologists descended on it to locate, study, and record
some of the last ivory-billed woodpeckers in existence. They
found the birds and were able to film and photograph them,
as well as make the only sound recordings of them in exis-
tence. The Audubon Society, the state of Louisiana, and
the U.S.
Fish and Wildlife Service
tried to buy the land
from Singer to make it a refuge for the rare birds. But Singer
781
had already sold timber rights to the land. During World
War II, when demand for lumber was particularly high, the
Singer Tract was leveled. One of the giant cypress trees that
was felled contained the nest and eggs of an ivory-billed
woodpecker. Land that had been virgin forest then became
soybean fields.
Few sightings of these woodpeckers were made in the
1940s, and none exist for the 1950s. But in the early 1960s
ivory-billed woodpeckers were reported seen in South Caro-
lina, Texas, and Louisiana. Intense searches, however, left
scientists with little hope by the end of that decade, as only
six birds were reported to exist. Subsequent decades yielded
a few individual sightings in the United States, but none
were confirmed.
In 1985 and 1986, there was a search for the Cuban
subspecies of the ivory-billed woodpecker. The first expedi-
tion yielded no birds, but trees were found that had appar-
ently been worked by the birds. The second expedition found
at least one pair of ivory-billed woodpeckers. Most of the
land formerly occupied by the Cuban subspecies was cut
over for sugar cane plantations by the 1920s, and surveys in
1956 indicated that this population had declined to about
a dozen birds. The last reported sightings of the species
occurred in the Sierra de Moa area of Cuba. They are still
considered to exist there, but the health of any remaining
individuals must be in question, given the
inbreeding
that
must occur with such a low population level and the fact
that so little suitable habitat remains.
In 1999, a student at Louisiana State University (LSU)
claimed to have seen a pair of ivory-billed woodpeckers
while he was
hunting
for turkey in the Pearl River
Wildlife
Management
Area near the Louisiana-Mississippi border.
The student, David Kulivan, was a credible witness, and he
soon convinced ornithologists at LSU to search for the birds.
News of the sighting attracted thousands of amateur and
professional birders over the next two years. Scientists from
LSU, Cornell University, and the Louisiana Department of
Wildlife
and Fisheries organized an expedition that included
posting of high-tech listening devices. Over more than two
years, no one else saw the birds, though scientists found
trunks stripped of bark, characteristic of the way the ivory-
billed woodpecker feeds, and two groups heard the distinct
double rapping sound the ivory-billed woodpecker makes
when it knocks a trunk. No one heard the call of the ivory-
billed woodpecker, though this sound would have been con-
sidered definitive evidence of the ivory-billed woodpecker’s
existence. Hope for confirmation of Kulivan’s sighting rested
on deciphering the tapes made by a dozen recording devices.
This was being done at Cornell University, and was expected
to take years.
By mid-2002, the search for the ivory-billed wood-
pecker in Louisiana had wound down, disappointingly in-