As I tried to make the best of my solitary confinement, I heard the men whistling to one another. They were saying, “I’ll go over there; you go that way,” and other such hunting talk. But clearly they were communicating. It was fascinating because it sounded so different from anything I had heard before. The whistles carried long and clear in the jungle. I could immediately see the importance and usefulness of this channel, which I guessed would also be much less likely to scare away game than the lower frequencies of the men’s normal voices.
