Nearly all differences were still significant when accounting for phylogenetic relationships in the analysis of variance (ANOVA) model, except for repertoire size between mimic and nonmimic songbirds, which still approached significance [phylogenetic ANOVA P value ( P AOV.PHYLO ) ~ 0.07; table S2B ].
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Songbird species that display more-complex vocal learning are better problem-solvers and have larger brains.
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