Waveform showing syllables produced by a partial closure of the forewings followed by a complete closure (Walker 1975).
Waveform showing syllables produced by a partial closure of the forewings followed
by a complete closure (Walker 1975).
Waveform of syllables preceding and following momentary break in summer song.
The initial syllables after the break do not include sounds that are clearly
the results of partial closures (Walker 1975).