Fig. 10 in Introgression at the emerging secondary contact zone of magpie Pica pica subspecies (Aves: Corvidae): integrating data on nuclear and mitochondrial markers, vocalizations, and field observations

Fig. 10 Spectrograms of chatter calls of pure P. p. leucoptera, pure P. p. jankowskii, and hybrids. a leucoptera, pair #4, Choibalsan, eastern Mongolia. b jankowskii, pair #6, Vladivostok, Russian Far East. c, d Bilingual hybrid, the same bird from the pair #24, Kerulen, eastern Mongolia. e Hybrid with mixed call, pair #39, Kerulen. f Presumably hybrid with mixed call, pair #5, Kerulen. X-axis—time in s; Y-axis—frequency in kHz