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Uploaded on Apr 30, 2010
Timber wolves howl at the Civil Defense siren located a few blocks from their lakefront home in Chicago's Lincoln Pk. Zoo. Just before 10 am on the first Tuesday of every month, the pack would assemble and then sing along with the familiar wailing alarm, an eerie remnant from the Cold War Era. (To use this video in a commercial player or in broadcasts, please email email@example.com)