MOBILE VERSION Sensitive indicators of the environment. Theme - «Bird Day»
Calendar: «National Bird Day (United States)», «International Migratory Bird Day», «World Migratory Bird Day», «Bird Day».
21 quotes & wishes
«Sensitive indicators of the environment» illustrated quotation. Bird Day, free quote pictures for Facebook, Twitter, LinkedIn, Reddit, Pinterest and other social networks.
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