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Preference response in frogs and bats. Proportions of frogs (black) and bats (gray) choosing the more complex call are shown as a function of chuck number relationships. Independent variables are (A) total call energy difference (dB), (B) chuck number difference, and (C) chuck number ratio. Curves are the least-squares fit of the psychometric function for data bound by 0.5 and 1.0 (10).
