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Fig. 2. Experimental designs for Megaderma lyra (A,B) and Phyllostomus discolor (C). The layout consisted of a starting perch and two ultrasonic speakers (ls), each of which was associated with a feeding dish (fd) next to the speakers. The angle between the speakers in the M. lyra experiments was 90°. This angle was positioned at an elevation of 45° (B). A microphone (mic) was placed in front of the bat's head to pick up its ultrasonic emissions. The P. discolor layout was a Y-shaped maze (45x30 cm; wire mesh); the angle between the two legs was 45°. The inner width of each leg was 10 cm.





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