Bubble ring play of bottlenose dolphins (Tursiops truncatus): implications for cognition.

@article{McCowan2000BubbleRP,
  title={Bubble ring play of bottlenose dolphins (Tursiops truncatus): implications for cognition.},
  author={Brenda McCowan and Lori Marino and Erik Vance and Leah Walke and Diana Reiss},
  journal={Journal of comparative psychology},
  year={2000},
  volume={114 1},
  pages={
          98-106
        }
}
Research on the cognitive capacities of dolphins and other cetaceans (whales and porpoises) has importance for the study of comparative cognition, particularly with other large-brained social mammals, such as primates. One of the areas in which cetaceans can be compared with primates is that of object manipulation and physical causality, for which there is an abundant body of literature in primates. The authors supplemented qualitative observations with statistical methods to examine playful… 

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