The ravens are back. Last year, they had a nest right on my hiking trail, but I didn’t notice them making it. I didn’t notice when they started guarding it or when the female laid eggs. I didn’t notice a thing. I never saw the nest—which is almost 5 feet across—and I’m not feeling too stupid about that because the nest is more than 100 feet in the air. I didn’t notice a thing until the chicks…