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Fig. 1. Spectrograms (top) and oscillograms (bottom) of signals broadcast to king penguin chicks to test their ability to localise the display call of their parents. (A) Natural (control) call; (B) call without amplitude modulation; (C) call with only the fundamental (baseline) frequencies kept. Colors, from blue (cold) to red (hot), represent increasing levels (in dB) of amplitude.





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