Rendell and Whitehead argue persuasively that individual foragingspecializations, if socially learned, are examples of cetaceanculture. However, they discount ecological variation experienced byindividuals within a population as a factor in such behavior. Isuggest that ecological variation may play an important role inindividual foraging specializations and describe several ecologicalparameters that may help us understand the high frequency of thisinteresting behavior in the marine habitat.