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Killer whales, blind bats, discriminating dolphins, mating birds
Date:6/25/2008

l show that acoustic data results from vocal nocturnal migrants correspond with the more traditional methods of bird banding and ground observations and can be an effective and complimentary method of monitoring bird migration. However, his results will also show that there are certain groups of more elusive and rare species that are much better represented in the acoustic data.

The presentation will also feature audio playback of bird records that highlight the ephemeral and unique qualities of these calls.

Paper 2aAB2, "The value of acoustic technologies for monitoring bird migration" will be presented at 8:20 a.m. on Tuesday, July 1, 2008 in Room 342B.

11) CONSERVATION AND THE TIGER'S ROAR

In Paris, Edward Walsh (walsh@boystown.org) from Boys Town National Research Hospital, Douglas L. Armstrong (douga@omahazoo.com) from the Henry Doorly Zoo, and their colleagues will present the most recent findings of the Omaha Tiger Project, one of the first and most detailed analyses of the auditory properties of tiger calls and tiger hearing. The research has confirmed the previously determined notion that the dominant frequency in at least some tiger calls is in the low frequency range of 200 Hz to 300 Hz. A question of interest to biologists is whether tigers produce calls in the infrasonic ranges, frequencies below 20 Hz that humans are not capable of hearing. The research has shown that although tigers are in fact capable of making these types of calls, and that they may be used when tigers are communicating over long distances, infrasonic energy is not a common feature of most calls studied thus far.

The greater goal of the Omaha Tiger Project is to contribute to ongoing efforts to conserve free ranging tigers, all of which are seriously endangered. Because effective conservation strategies require an accurate knowledge of the number of indivi
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Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

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