The gray whale (scientific name: Eschrichtiusrobustus) belongs to the family of gray whales in the suborder of baleen whales of the order Artiodactyla. It has a larger body circumference than species in the family of baleen whales, but smaller than the humpback whale; Its adult length is 10 to 15 meters (female whales are slightly larger than male whales), and its maximum weight exceeds 35 tons. The body is spindle shaped, with a thick and chubby trunk, thickest near the fins, and gradually narrows towards the tail. Without dorsal fins, there are 8-15 low peaks along the posterior one-third of the spine, with the first peak being the largest and decreasing towards the tail. Mainly feeds on planktonic small crustaceans, herring eggs, and other group fish. But they do not feed during their southward migration.