The other creatures with which we share this world have their rights too, but not speaking our language, they have no voice, no vote; it is our moral duty to take care of them.

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.

Butterflies may be better indicators of the health of our environment than birds.

I can recognize the calls of practically every bird in North America. There are some in Africa I don't know, though

Birds are indicators of the environment. If they are in trouble, we know we'll soon be in trouble.

The other creatures with which we share this world have their rights too, but not speaking our language, they have no voice, no vote; it is our moral duty to take care of them.

Birds are an ecological litmus paper.