Sensitive indicators of the environment. Theme - «Bird Day»

Nature

Calendar: «National Bird Day (United States)», «International Migratory Bird Day», «World Migratory Bird Day», «Bird Day».

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Quotes and wishes: «Bird Day»

Sensitive indicators of the environment

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