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. 2016 Jul 6;10:309. doi: 10.3389/fnins.2016.00309

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Copyright © 2016 Norton and Scharff.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Frequencies of the best fitting pulses^S for all analyzed chunks of undirected song for all 15 birds (bird ID numbers depicted on x-axis). Circles indicate frequency clusters as determined by hierarchical clustering analysis. Circle size corresponds to the percentage of chunks in the cluster relative to all chunks from the respective bird. The cluster containing the most chunks for each bird is black, the number inside the circle indicates the percentage of chunks within that cluster.