Birds are an ecological litmus paper.

Butterflies are very interesting. Here these things are little grubs for a while. And then they go into a little coffin. There they are in a sarcophagus, and then they come out and dance with the angels.

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.

We don't have to go to wild places to find wildlife. A surprisingly wide range of species can be found in our sities and towns, from familiar animals like the raccoon to more exotic ones like the mountain lion.

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.

Birds have wings; they're free; they can fly where they want when they want. They have the kind of mobility many people envy.