I had the hardest time finding that section again after my first read-through, and it drove me nuts because it's such a crucial turning point. It's a lot deeper into the book than you might think—it's not in the early wilderness survival chapters. You need to be past the halfway mark. I flipped through my physical copy for ages before I caved and checked the ebook's search function. Turns out it's in Chapter 27, about two-thirds of the way through, right after the protagonist makes that tense decision to leave the river valley. The scene itself is brutal and oddly beautiful, the way the writing slows down to focus on the texture of the feathers and the starkness of the cliffside.
Searching for it taught me that the chapter titles in this edition are pretty abstract, so they're no help. If you're using an audiobook, it's roughly around the 12-hour mark in a 17-hour narration, but that can vary by publisher. What really struck me on the re-read was how the nest isn't just a physical location; it's where the character's isolation peaks, and the vulture's indifference to his struggle becomes a weirdly comforting mirror. Finding it again made the whole book's theme of harsh acceptance click into place for me.