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1 October 2013 Indo-Pacific humpback dolphins ( Sousa chinensis) assist a finless porpoise ( Neophocaena phocaenoides sunameri) calf: evidence from Xiamen waters in China
Xianyan Wang, Fuxing Wu, Jianfeng Mou, Qian Zhu
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Abstract

Interactions between cetacean species are common events that can lead to the formation of mixed-species groups, which have been reported in both captive and wild odontocetes. However, mixed groups containing Indo-Pacific humpback dolphin (Sousa chinensis) and the finless porpoise (Neophocaena phocaenoides) rarely have been seen, and detailed interactions between these 2 species have been limited. For the first time, this paper describes wild Indo-Pacific humpback dolphins assisting a finless porpoise (N. p. sunameri) calf in Xiamen waters, China. A group of 8 humpback dolphins amicably herded a finless porpoise calf for more than 3 h. The humpback dolphins accompanied the finless porpoise calf and took turns pushing the calf out of the water to breathe. This paper provides a detailed behavioral description of these interactions, and we discuss the potential causes of this event.

Xianyan Wang, Fuxing Wu, Jianfeng Mou, and Qian Zhu "Indo-Pacific humpback dolphins ( Sousa chinensis) assist a finless porpoise ( Neophocaena phocaenoides sunameri) calf: evidence from Xiamen waters in China," Journal of Mammalogy 94(5), 1123-1130, (1 October 2013). https://doi.org/10.1644/13-MAMM-A-064.1
Received: 5 March 2013; Accepted: 1 April 2013; Published: 1 October 2013
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KEYWORDS
assisting calf
behavior
finless porpoise
Indo-Pacific humpback dolphin
mixed-species group
Neophocaena phocaenoides sunameri
Sousa chinensis
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