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. — Roger Tory Peterson Copy Share Image
Butterflies may be better indicators of the health of our environment than birds. — Roger Tory Peterson Copy Share Image
More birds have adapted to a changing world than have failed. Very few have the narrow tolerance of the ivory-billed woodpecker or the Bachman's… — Roger Tory Peterson Copy Share Image
The philosophy that I have worked under most of my life is that the serious study of natural history is an activity which has… — Roger Tory Peterson Copy Share Image
Penguins are an indicator of the health of our watery planet, and if they are unable to survive, we had better take notice or… — Roger Tory Peterson Copy Share Image
I can recognize the calls of practically every bird in North America. There are some in Africa I don't know, though — Roger Tory Peterson Copy Share Image
Butterflies are very interesting. Here these things are little grubs for a while. And then they go into a little coffin. There they are… — Roger Tory Peterson Copy Share Image
Birds are indicators of the environment. If they are in trouble, we know we'll soon be in trouble. — Roger Tory Peterson Copy Share Image
Vultures are homely, but they clean up all the garbage and that's good. And they're elegant in the sky. — Roger Tory Peterson Copy Share Image
Butterflies may be better indicators of the health of our environment than birds. — Roger Tory Peterson Copy Share Image
Of all the various out-door recreations I have tried, when it comes to genuine, exciting sport, give me hunting with a camera… — Roger Tory Peterson Copy Share Image
Birds ... are sensitive indicators of the environment, a sort of "ecological litmus paper," ... The observation and recording of bird populations over time… — Roger Tory Peterson Copy Share Image
