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Eschrichtiidae (order Cetacea, suborder Mysticeti) A monospecific family (Eschrichtius gibbosus, the grey whale) of baleen whales in which the baleen plates are short and narrow and the left and right rows are separated at the front of the mouth. The snout is blunt, typically there are two grooves on the throat, and the body is slender. Grey whales are mostly grey in colour but with white mottling; they grow to a length of 11–15 m. They are seasonal migrants within the northern Pacific and feed on benthic Amphipoda.