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Whistle sequence and composition of each of the twelve copy playbacks. Each letter represents a different whistle type, which is positioned to when it was produced in relation to the playback (start at time of playback = 0) is shown. The “R” shows where animals replied with the same whistle as the playback stimuli (replies) as decided by human observers. The animals never produced the same whistle as the playback stimulus (labeled R) in the 1 min preceding a playback.
