natural car alarms

"They’re all real birds," Katchadourian says of her Natural Car Alarms. "They are all a little bit re-edited so that I could... get this patterning to work. And they are -- like car alarms -- quite loud, quite shrill."

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She tells Karr she built the hardware for her alarms from car stereos and microprocessor chips. She got the basic bird sounds from the Macauley Library of Natural Sounds at Cornell University. Her sonic aviary includes the mating call of the Three-Wattled Bellbird, the everyday song of the Northern Bobwhite, and the rare Ivory-Billed Woodpecker -- which hasn’t really been seen for about 70 years, and may be extinct.