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(a) Population-level migration trajectories within the Western Hemisphere at a daily temporal resolution for 118 migratory bird species for the combined period 2002–2014. (b) Migration trajectory classification within 1° latitudinal bands for the 118 species with each point defining species' annual centroid within that band (note the use of transparent points). From the 118 species, 53 were classified as clockwise, 14 as anticlockwise, and 51 as repeated.
