We disagree with two of Rendell and Whitehead's assertions. Culture may be
an ancestral characteristic of terrestrial cetacean ancestors; not derived
via marine variability, modem cetacean mobility, or any living cetacean soc
ial structure. Furthermore, evidence for vocal behavior as culture, social
stability, and cognitive ability, is richer in birds than Rendell and White
head portray and comparable to that of cetaceans and primates.