Saunders, J.C. and Dooling, R.J. (1974). Noise-induced threshold shift in the parakeet (Melopsittacus undulatus). Proceedings of the National Academy of Sciences, 71, 1962-1965.

Parakeets exposed for 72 hr to a 1/3-octave band of noise centered at 2.0 kHz have a maximum threshold shift at 2.0 kHz with little or no spread of threshold shift to lower or higher frequencies. These results differ from those observed in mammals and suggest significant differences between avian and mammalian peripheral auditory processing