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.

The truth of the matter is, the birds could very well live without us, but many -- perhaps all -- of us would find life incomplete, indeed almost intolerable without the birds.

The more you look, the more you will see.

Birds are an ecological litmus paper.

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

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

Penguins are an indicator of the health of our watery planet, and if they are unable to survive, we had better take notice or we might find our own survival threatened.