须鲸 'xū jīng 'Balaenoptera

须鲸（学名：Balaenoptera）是须鲸类动物总称，包括蓝鲸、长须鲸、大翅鲸（座头鲸）、露脊鲸、灰鲸等，全世界现生种类一共15种，其中，中国发现的有9种。须鲸类动物体长约为15～20米，体重25吨左右，身体细长、背部黑色、腹部白色，交界线波状或云状，过渡区呈灰色，鳍肢和尾鳍的下面为灰色，背鳍呈镰刀形，向后倾斜。每侧的须板为黑色，约300～400枚，故称“黑板须鲸”。喷出的水柱又高又细，垂直。

Baleen whales (scientific name: Balaenoptera) are the general name of baleen whales, including blue whales, fin whales, large winged whales (humpback whales), right whales, gray whales, etc. there are a total of 15 species in the world, including 9 species found in China. Baleen whales are about 15-20 meters long and weigh about 25 tons. They are slender, black in back, white in abdomen, wavy or cloudy in boundary, gray in transition area, gray below fin limb and tail fin, and sickle shaped in dorsal fin. The whiskers on each side are black, about 300-400, so it is called "blackboard baleen whale". The jet of water is high, thin and vertical.