During a time when most wild animals are experiencing decline in the face of development and climate change, the intrepid mountain lion — also known as a puma, a cougar, and by many other names – has experienced reinvigoration as well as expansion of territory. What makes this cat, the fourth carnivore in the food chain — just ahead of humans – so resilient and resourceful? And what can conservationists and wild life managers learn from them about the web of biodiversity that is in desperate need of protection? Their story is fascinating for the lessons it can afford the protection of all species in times of dire challenge and decline.