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Figure 5 | BMC Evolutionary Biology

Figure 5

From: The evolution of contact calls in isolated and overlapping populations of two white-eye congeners in East Africa (Aves, Zosterops)

Figure 5

Typical sonograms of the calls of the highland Zosterops poliogaster (A) and lowland Zosterops abyssinicus (B), displaying the parameters analysed for this study: 1: starting frequency (typically congruent with lowest frequency); 2: first peak (typically congruent with highest frequency); 3: highest frequency; 4: end-frequency (sometimes congruent with lowest frequency); additional characters measured were total call duration (seconds) and frequency range (highest to lowest frequency).

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