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The behavioral ecology of offshore delphinids and baleen whales is poorly known . A comparative approach was used to assess group size and behavior versus risks / rewards of group living in the Southern Californ ia Bight, U.S. Scan sampling / photographs / video documented first-observed group size, behavior state, and group cohesion (i .e., maxi mum nearestneighbor distance (MNND- in body lengths[BL]), during 72 ,467 km of aerial surveys between 2008-2013.