Fig. 1. Sequence of sounds produced by air flowing through the larynx of a euthanized frog, showing bifurcations from a limit cycle to subharmonics and chaos as sublaryngeal pressure driving airflow increases (A), and reverse sequence from chaos through subharmonic regimes as pressure decreases (B). Note the abrupt drop in the sound level during the harmonic window in the chaos. Subharmonics that are fractional integers of fundamental frequency (f₀) are only faintly visible because of roll-off of the ultrasonic microphone. An 8 s segment of chaos between the end of (A) and beginning of (B) is omitted. 1 cmH₂O=98 Pa.