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Haplotype network for Nazca boobies (Sula granti) (A) and great frigatebirds (Fregata minor) (B) based on three mitochondrial genes. Circles are proportional to the number of individuals that share the haplotypes and the colors correspond to different islands. Black = Darwin, blue = Wolf, green = Genovesa, red = Española, purple = San Cristobal (Nazca booby only), yellow = N. Seymour (great frigatebird only).
