The Photographic Determination of Group Size, Composition, and Stability of Coastal Porpoises (Tursiops truncatus)

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Science  18 Nov 1977:
Vol. 198, Issue 4318, pp. 755-756
DOI: 10.1126/science.198.4318.755


During a 21-month study, 53 individual bottle-nosed porpoises were recognized by photographs of their dorsal fins. They traveled in small subgroups (mean size = 15) composed of a stable core of five animals plus other individuals that varied greatly from sighting to sighting.