Camping with President Roosevelt by John Burroughs

The next morning we set out for our second camp, ten or a dozen miles away, and in reaching it passed over much of the ground the President had traversed the day before. As we came to a wild, rocky place above a deep chasm of the river, with a few scattered pine trees, the President said, "It was right here that I heard that strange bird song." We paused a moment. "And there it is now," he exclaimed.