The study also raises questions about the self-awareness of dolphins and the ethics of using these animals in scientific experiments. The topic of animal consciousness is controversial, and this kind of research strengthens many scientists' conviction that dolphins have an acute sense of themselves and others.
Complete results of the study will be published in the May issue of the Proceedings of the National Academy of Sciences and online at www.pnas.org.
This story was aired on the television news show National Geographic Today on May 1 and 2.
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