Additional file 8 of A 30,000-km journey by Apus apus pekinensis tracks arid lands between northern China and south-western Africa

Additional file 8. Figure S3. Maps showing the migration routes of five individuals in two years. The pentagram represents the bird breeding site and fieldwork location -Beijing. The dotted lines indicate the lack of data in the two weeks before/after the autumn/spring equinoxes. The yellow lines represent the autumn routes, the blue line represent the spring routes.