Unrooted haplotype network of COI gene sequence, based on a median-joining network for the Common Barn Owl and the Short-eared Owl. The area of each circle is proportional to the number of individuals containing the haplotype. Open circles indicate mutational events and numbers refer to the variable nucleotide positions. A Common Barn Owl; Solid black: Chile/South America; white with cross lines: Argentina/South America; white with forward diagonal lines: USA/ North America; white with horizontal lines: El Salvador/ Central America; white with vertical lines: Canada/ North America; white with backward diagonal lines: Sweden/ northern Europe; white with backward diagonal cross lines: Australia/ Australasia. B Short-eared Owl; Solid black: Chile/South America; white with cross lines: Argentina/South America; white with forward diagonal lines: USA/ North America; white with horizontal lines: Canada/ North America; white with backward diagonal lines: Sweden/ northern Europe; white with horizontal lines: Russia/ northern Asia; white with cross diagonal lines: Norway/ northern Europe.