Prenatal Auditory Sensitivity in Chickens and Ducks

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Science  26 Mar 1965:
Vol. 147, Issue 3665, pp. 1596-1598
DOI: 10.1126/science.147.3665.1596


Recordings from chick and duck fetuses inside the egg revealed an increase in the rate of bill-clapping and vocalization when the fetuses were aurally stimulated by the maternal call of their species on the day before hatching.