Sowerby's beaked whales are known almost exclusively from the colder waters of the North Atlantic, from at least Massachusetts, USA to Labrador, Canada in the west, and from Iceland to Norway in the east (Mead 1989; MacLeod et al. 2006). This is the most northerly distributed of the Atlantic species of Mesoplodon, with most records north of 30°N. There are a number of strandings or sightings considered to be extralimital in the Mediterranean Sea, and from the Gulf of Mexico side of Florida.
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