Fig. 1From: Is male condition corrected with song features in Dusky Warblers (Phylloscopus fuscatus)Spectrogram of two distinct kinds of song in Dusky Warblers (a S-song; b V-song). Several sound parameters, high frequency, low frequency, start frequency, end frequency, bandwidth and duration of song and trill, are shown in the spectrogram of V-songBack to article page