With only dull light available from a torch, which couldn’t be carried into very narrow passages, the ancient hunters had to use their voices like sonar to explore the crooks and crannies of a newfound cave, Reznikoff explained.
“When acting in a cave in conditions similar to prehistoric ones ... the surroundings a few meters ahead are almost completely dark,” he said, adding that “since sound reaches much farther than reduced light, especially in irregular surroundings, the only possibility and security is to explore the cave with the voice and its echoing effects.”
Caveman: I be calling you...ooh..ooh..ooohh ooh ooh.(With apologies to the Jeanette McDonald and the Indian love call)
CaveBear: GRRROOOWR.