This book is so poorly written that I couldn't finish it. At the sentence level, the prose is not great, but nor is it terrible, however reading paragraphs is where it all falls apart. The ideas just don't hang together from one sentence to the next eg. "And, somehow, thoughts of mountain lions obliquely led me to a consideration of the fine arts of Japan." Wait, what? Although at least in this example the author acknowledges his segue. Generally he just marches from binoculars to learning to Gary Snyder to cougar biology without even taking a breath. Beyond that, very few of the chapters have any narrative structure and the book doesn't hold together at all. If you threw all the chapters up in the air and placed them in the book as they fell, it wouldn't lose anything in cohesion. The ideas are trite eg. "Part of the delight of looking for something is not knowing when it might turn up," and the very few interesting ones are introduced with so little context you might as well be reading fortune cookies
Also, don't be fooled by the title of the book into expecting some sort of tense climax with the cougar finally caught in fading light, or the author caught in fading light. There's no fading light at all except the gradual loss of the will to live as you read, "I remembered, then, another story..." for the hundredth time.