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  • Title: Budgerigars (Melopsittacus undulatus) do not hear infrasound: the audiogram from 8 Hz to 10 kHz.
    Author: Heffner HE, Koay G, Heffner RS.
    Journal: J Comp Physiol A Neuroethol Sens Neural Behav Physiol; 2016 Dec; 202(12):853-857. PubMed ID: 27678397.
    Abstract:
    The pure-tone thresholds of three budgerigars were determined from 8 Hz to 10 kHz. At a level of 60 dB sound pressure level (re 20 μN/m2), their hearing range extends 6.6 octaves from 77 Hz to 7.6 kHz, with a best sensitivity of 1.1 dB at 3 kHz. Unlike pigeons and chickens, budgerigars do not have better low-frequency hearing than humans. This difference implies anatomical, physiological, and ecological differences between birds that hear infrasound (so far, pigeons and chickens) and those that do not (budgerigars).
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