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Fig. 2. Initial movements of flies at the onset of walking phonotaxis are not
stereotyped. Flies lunge forward with both prothoracic legs in response to a
sound source directly ahead (A). In response to a lateral sound source, flies
may initiate phonotaxis by stepping with either the ipsilateral (B) or
contralateral (C) prothoracic legs, or with the contralateral mesothoracic leg
(D).