There's a killer inside us. Our biology, culture, technology, and economy have transformed our species into the greatest predator the world has ever seen. From Yellowstone to Mozambique, Shane explores our global impact as the planet's top predator.

Shane explores the surprising science and unexpected histories of "The Replacements": five animal and plant species that made allies of humans, grew to dominate the planet alongside us, and changed their destinies (and our own) forever.