Beyond Falsetto: Do mice sing at ultrasonic frequencies?

Male mice may serenade prospective mates at pitches about two octaves higher than the shrillest sounds audible to people.

Holy and Guo

SCIENTIFIC IDOL. Mice string “chirplike” ultrasonic noises (shown graphically in yellow) into song, according to a new report. Holy and Guo

This “mouse song” is comparable in complexity to the sequences of tones that songbirds and some whales make, say Timothy E.