Underwater Sounds Produced by Neonatal Bottlenose Dolphins (Tursiops truncatus): II. Potential Function

Author: Morisaka Tadamichi   Shinohara Masanori   Taki Michihiro  

Publisher: European Association for Aquatic Mammals

ISSN: 0167-5427

Source: Aquatic Mammals, Vol.31, Iss.2, 2005-09, pp. : 258-265

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Abstract

Neonatal bottlenose dolphins (Tursiops truncatus) produce many sounds just after birth, including whistles and pulsed sounds. Herein, we report the possible function of the sounds produced by two captive-born, neonatal bottlenose dolphin as revealed by behavioural observations. Typical sucking sounds were observed during 71 to 81% of all suckling bouts. Since the neonates produced more sounds at the beginning of the suckling sequence than expected, it appeared that they might use the sounds as care-solicitation signals or begging signals. These sounds contained a higher proportion of whistles than sounds in other contexts, which implied that the proportions of sound types, especially whistles, were important for neonatal dolphins and their mothers to initiate the nursing sequence.

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