FIGURE 1 in On the taxonomic status of the Siberian Chiffchaff Phylloscopus [collybita] tristis (Phylloscopidae)

FIGURE 1. Sonagrams of typical songs and calls recordings retrieved from xeno-canto.org. A) Phylloscopus collybita (abietinus) song (XC718643; Pärnu, Estonia, Uku Paal); B) Phylloscopus c. (abietinus) calls (XC147829; Cheboksary, Russian Federation, Albert Lastukhin); C) Phylloscopus [c.] tristis song (XC486704; Parfenovka, Russian Federation, Stanislas Wroza); D) Phylloscopus [c.] tristis calls (XC750898; Novosibirsk, Russian Federation, Geoff Carey).