The Gray Whale Eschrichtius Robustus,[1] Also Known As The Grey Whale,[4] Gray Back Whale, Pacific Gray Whale, Or California Gray Whale[5] Is A Baleen Whale That Migrates Between Feeding And Breeding Grounds Yearly. It Reaches A Length Of 14.9 Meters 49 Ft, A Weight Of 36 Tonnes 40 Short Tons, And Lives Between 55 And 70 Years.[6] The Common Name Of The Whale Comes From The Gray Patches And White Mottling On Its Dark Skin.[7] Gray Whales Were Once Called Devil Fish Because Of Their Fighting Behavior When Hunted.[8] The Gray Whale Is The Sole Living Species In The Genus Eschrichtius, Which In Turn Is The Sole Living Genus In The Family Eschrichtiidae. This Mammal Descended From Filter-Feeding Whales That Appeared At The Beginning Of The Oligocene, Over 30 Million Years Ago.

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