. Echoes of bats and men . fi^^tA^l^^^ Fig. 14. Schematic graphs of a bat's chirp and the echoes in the flight room {Fig. 12) under various test conditions: A—approaching wires in the middle of room; B—approaching same wires near the end wall; C—approaching larger wires close to the end wall {note the larger echo); and D—approaching an insect under natural conditions in woods where many other objects also return echoes. {For simplicity the frequency modulation is not shown.) 102

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