The 2020 Ig Nobel Acoustics Prize was awarded to Stephan Reber and colleagues (Stephan Reber, Takeshi Nishimura, Judith Janisch, Mark Robertson, and Tecumseh Fitch) for inducing a female Chinese alligator to bellow in an airtight chamber filled with helium-enriched air.

Awarded paper: Reber, S., Nishimura, T., Janisch, J., Robertson, M., & Fitch, T. (2015). A Chinese alligator in heliox: Formant frequencies in a crocodilian. Journal of Experimental Biology, 218, 2442-2447.