Map of Iran with Guilan province highlighted, showing collecting localities. Pink stars = provinces with positive ducks for both T. franki and T. regenti, and in some cases co-infections; Yellow stars = provinces with positive ducks for only T. franki; Blue stars = provinces with positive ducks for only T. regenti; Circles without numbers = areas with negative ducks; and Circles with numbers = localities from which worms were used for sequencing.