Musculus) is a marine mammal belonging to the suborder baleen whales. * * * There are four subspecies. The blue whale is considered to be the largest known animal that has ever lived on the earth, with a length of 33 meters and a weight of over100t. The blue whale has a slender body and a bluish-gray back, but sometimes it looks lighter in water. Blue whales mainly feed on small crustaceans (such as krill) and small fish. Usually, blue whales need to feed in the sea area with a depth of more than 100 meters during the day, and they can only feed on the water surface at night. Blue whales begin mating in late autumn and continue until the end of winter.

Female whales usually give birth once every two to three years, and after10 ~12 months of pregnancy, they usually give birth to young whales in early winter. All four oceans are distributed. -Baidu Encyclopedia