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Why Do Female Killer Whales Live So Long? (1 of 5)

Caption: This shows a post-reproductive mother and son. This image relates to a paper that appeared in the August 31, 2012, issue of Science, published by AAAS. The paper, by E.A. Foster at University of Exeter in Exeter, UK, and colleagues was titled, “Adaptive Prolonged Postreproductive Life Span in Killer Whales.”

Credit: [Photo by David Ellifrit, Centre for Whale Research]

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