The video below is a good, brief summary of one of my very favorite stories. It's the story of how the restoration of wolves to Yellowstone improved the entire ecosystem. Everything is connected, like a complex, living puzzle, and there is more beauty to the whole when all the pieces are present.
"When we try to pick out anything by itself, we find it hitched to everything else in the Universe." — John Muir, My First Summer in the Sierra.