Imagine as a life's work toting loudspeaker, tapes, batteries, and video camera around the Okavango Delta, occasionally being treed by lions or warned off by elephants. You skulk into long grass to conceal the speaker, then wait and wait until the supposed author of the playback call is safely out of sight and the intended hearer facing at least 90° away. It may take you a whole year to complete one series of experiments—all with the goal of confusing a baboon.
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