Correlated evolution between repertoire size and song plasticity predicts that sexual selection on song promotes open-ended learning.

6) Throughout the paper I kept wondering if there is a simple way of telling which came first: song learning duration or syllable per song? Can you look at specific trajectories to get some clues, even if not statistical? If there were a consistent pattern of which came first, song learning duration or song complexity, we should see a clear trend with the BayesTraits analysis, which would appear as a single directional arrow away from an unstable combination of traits.

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These rate differences are highly significant (100% of runs significant in this range).

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