I was out on a different trail, earlier this week, and I again heard the repeated song. I stopped and looked into the trees, and sure enough my little black-and-white friend was gazing out at me. He then got back to business with a nuthatch-like creep along the tree trunks, looking for bugs.
He may be tiny (as warblers are), but this guy doesn’t get off in the rarefied air of the tree tops. He’s at home hopping along on trunks just a few feet off the ground. Keeping an eye out for excited hikers, he’s ready with a wee see!