Our understanding of cetacean diving behaviour has recently increased (West-gate et al. 1995, Heide-Jorgensen and Dietz 1995, David et al. 1996). However, there are few reports which measured swim speed of free-ranging cetaceans (Hanson and Baird 1998). Measurement of swim speed during diving helps to understand the dive function (Boyd et al. 1995, Crocker et al. 1997) at the swimming effort or energetics (Feldkamp 1987). We report here the first record of the diving behavior and swimming speed of a free-ranging harbor porpoise.
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