Birds are indicators of the environment. If they are in trouble, we know we'll soon be in trouble.
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.
The philosophy that I have worked under most of my life is that the serious study of natural history is an activity which has far-reaching effects in every aspect of a person's life. It ultimately makes people protective of the environment in a very committed way. It is my opinion that the study of natural history should be the primary avenue for creating environmentalists.
Butterflies may be better indicators of the health of our environment than birds.
Conservation is not just an ideal that we read about; it works.
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