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Despite significant effort, only two published reports describe Bryde's whale (Balaenoptera edeni) calls (Cummings et al. 1986, Edds et al. 1993). In both studies fundamental call frequencies were greater than 90 Hz, somewhat higher than the call frequencies attributed to other balaenopterids (Clark 1990, Edds-Walton 1997). Through opportunistic acoustic recordings, we obtained and analyzed numerous examples of Bryde's whale calls from three habitats: the Eastern Tropical Pacific (ETP), the southern Caribbean, and the northwest Pacific near the coast of Japan. In all but a single case, call frequencies of 60 Hz or less were observed.