Figure 1.

Localities. Map of localities where males of the Thrush Nightingale (Luscinia luscinia) and the Common Nightingale (Luscinia megarhynchos) were sampled. White - allopatric range of L. megarhynchos, dark grey - allopatric range of L. luscinia, light grey - range overlap of both species (i.e., sympatry). Species' ranges are redrawn with modifications from Sorjonen [43], Cramp [46] and Hagemeijer and Blair [54].