. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel SYSTEMATIC ACCOUNTS LARGE CETACEANS (12-26 meters maximum length) This section includes seven of the nine baleen whales which occur in the eastern North Pacific and adjacent Arctic waters (the eighth, the minke whale, Bnlaenoptera acutorostrata, which reaches only about 10 m maximum length,
. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel SYSTEMATIC ACCOUNTS LARGE CETACEANS (12-26 meters maximum length) This section includes seven of the nine baleen whales which occur in the eastern North Pacific and adjacent Arctic waters (the eighth, the minke whale, Bnlaenoptera acutorostrata, which reaches only about 10 m maximum length, is listed with the medium-sized whales; the ninth, the bowhead whale, Balacna mysticetus, is restricted to the Bering, Chukchi, and Beaufort Seas). Four of those occur regularly, three rarely if at all in the SCB. The group also includes the two largest toothed whales, the sperm whale, Physeter macrocepbalus, and Baird's beaked whale, Berardius bairdii, both of which are found commonly in pelagic waters along and west of the Patton Escarpment and also enter the SCB. Residents and Common Migrants. Gray Whale Eschrichtus robustus Lilljeborg, 1861 The gray whale is probably the best known of the great whales of the northeastern Pacific and the species most frequently encountered in and near the CINMS, albeit seasonally. The vast majority of the population spends the winter in subtropical calving/breeding lagoons of mainland Mexico and the west coast of Baja California and summer in arctic and subarctic waters above Unimak Pass, principally the northern Bering and southern Chukchi seas. Migrations betweeen these widely separated "grounds" occur, for the most part, at predict- able times and along well defined routes. Although there are a few early migrants and stragglers, the vast majority of southbound migrating gray whales leave the Bering Sea between mid-November and mid-December in components some- what segregated by age-sex class. The southbound movement along the Pa
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