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Published online by Cambridge University Press: 30 October 2001
We disagree with two of Rendell and Whitehead's assertions. Culturemay be an ancestral characteristic of terrestrial cetaceanancestors; not derived via marine variability, modern cetaceanmobility, or any living cetacean social structure. Furthermore,evidence for vocal behavior as culture, social stability, andcognitive ability, is richer in birds than Rendell and Whiteheadportray and comparable to that of cetaceans and primates.