Avian evolution, lack of diversification, oceanic islands, Macaronesia, gene flow, DNA, Mitochondrial - genetics, Songbirds - genetics, Songbirds - anatomy & histology, Genetics, Mitochondrial DNA, Birds, Acoustics, Evolution, Morphology, Macaronésia, Macaronésia, Macaronésia, Macaronésia, Macaronésia, Macaronesian, Macaronésia, Macaronesian, Macaronésie, Ma...