Earth First!
The animals and plants in nature don't have the same loud garish voices that humans have, but they are certainly crying in agony and desperation if one listens carefully enough. The main cause of extinction is destruction of habitat, which today is happening at an alarming rate. The valiant people of Earth First and many other organizations are working hard to prevent the old consumerist thought-systems of corporations ruin the natural long-lived ecosystems before it's too late. Animals need intelligent humans acting on their behalf to prevent the bulldozer of modern society from flattening the landscape of biodiversity.