1. Department of Ecology and Evolutionary Biology; University of California; 621 Charles E. Young Drive South Los Angeles California 90095-1606 U.S.A
2. Mingan Island Cetacean Study, Inc.; 378 Bord de la Mer Longue-Pointe-de-Mingan Quebec G0G 1V0 Canada
3. Mériscope Marine Research Station; 7 chemin de la Marina, Portneuf-sur-Mer; Rheinsprung 9 Quebec G0T 1P0 Canada
4. Department of Marine Biology; Texas A&M University; 200 Seawolf Parkway Galveston Texas 77553 U.S.A