Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New ivory-billed woodpecker recordings to be released

25.08.2005


Cornell researchers say double knocks may be ’soundprints’ of ivory-bills


The public is invited to join in, listen and help decipher the sounds of the ivory-billed woodpecker By Simeon Moss

Now hear this: After analyzing more than 18,000 hours of recordings from the swampy forests of eastern Arkansas, researchers at the Cornell Laboratory of Ornithology at Cornell University have released recordings offering further evidence -- including the legendary bird’s distinctive double knock -- for the existence of the ivory-billed woodpecker, once thought extinct. These sounds were recorded in the same area of Arkansas where the species was rediscovered in 2004.

The Cornell researchers announced the results at the annual meeting of the American Ornithologists’ Union in Santa Barbara, Calif., Aug. 24, and they have invited the public to listen to the calls and knocks on the Web at http://www.birds.cornell.edu.



The recordings reveal sounds that, experts say, are strikingly similar to those made by ivory-billed woodpeckers and provide compelling information that can be added to evidence already gathered of the bird’s existence. One of the recordings, from Jan. 24, 2005, captured a distant double knock, "Bam bam!" followed by a similar and much closer double knock 3.5 seconds later -- possibly the drumming displays of two ivory-billed woodpeckers communicating with one another by rapping on trees.

"I immediately felt a thrill of excitement the first time I heard that recording," said Russell Charif, a bioacoustics researcher at the Cornell Lab of Ornithology. "It is the best tangible evidence so far that there could be more than one ivory-bill in the area."

Only a single bird at a time was documented through sightings and video footage during a yearlong search of the area in 2004-05. Whether more than one bird exists is still a big question, Charif said, but quantitative analyses of the most promising sounds indicate a high probability that they were made by ivory-billed woodpeckers.

The sounds were recorded on autonomous recording units (ARUs) designed by the Cornell lab and strapped to trees in the swamp. More than 150 sites were monitored in the half-million-acre "Big Woods" of Arkansas.

After eliminating thousands of noises from gunshots and other sources, the researchers found about 100 double knocks that bear a strong resemblance to the display drumming of the ivory-bill’s closest relatives. The sounds were clustered around certain recording locations at certain times of day -- a pattern that would not be expected if they had been produced by random noises.

Then ARUs also recorded nasal tooting calls similar to those of ivory-billed woodpeckers. Charif said blue jays are notorious vocal mimics that sometimes utter calls like those of ivory-bills. However, he added, a sophisticated acoustic classification program categorized nearly all of the unknown calls from Arkansas as most similar to ivory-billed woodpecker recordings. None matched up with "tooting" calls of blue jays from the Cornell lab’s audio collection, but the researchers say they cannot rule out blue jays until they analyze more variants of the calls.

"We’re excited and encouraged by the acoustic analysis," said John Fitzpatrick, director of the Cornell Lab of Ornithology. "These sounds give us additional hope that a few ivory-billed woodpeckers do live in the White River and Cache River region. But this species is still on the verge of extinction and huge mysteries remain to be solved. Certainly, we have a lot more work to do before we know enough to determine its population size, let alone ensure its survival."

A team led by the Cornell Lab of Ornithology, The Nature Conservancy, the U.S. Fish and Wildlife Service, the Arkansas Game and Fish Commission, and other partners, will renew search efforts in the Big Woods beginning Nov. 1.

Blaine Friedlander | EurekAlert!
Further information:
http://www.birds.cornell.edu
http://www.cornell.edu

More articles from Life Sciences:

nachricht Flow of cerebrospinal fluid regulates neural stem cell division
22.05.2018 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

nachricht Chemists at FAU successfully demonstrate imine hydrogenation with inexpensive main group metal
22.05.2018 | Friedrich-Alexander-Universität Erlangen-Nürnberg

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>