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Birds ... Are Sensitive Indicators Of The Environment, A Sort Of "ecological Litmus Paper," ... The Observation And Recording Of Bird Populations Over Time Lead Inevitably To Environmental Awareness And Can Signal Impending Changes.
-Roger Tory Peterson
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Birds ... Are Sensitive Indicators

Roger Tory Peterson
Birds ... Are Sensitive Indicators Of The Environment, A Sort Of "ecological Litmus Paper," ... The Observation And Recording Of Bird Populations Over Time Lead Inevitably To Environmental Awareness And Can Signal Impending Changes.
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Change
Science
Bird
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