Ma'anar ƙamus na "blue whale" wani nau'i ne na manyan dabbobi masu shayarwa na ruwa wanda ke cikin dangin baleen whale. Ita ce dabba mafi girma a duniya, tana girma zuwa ƙafa 100 a tsayi kuma tana da nauyin tan 200. Blue Whales yawanci launin shuɗi-launin toka ne kuma suna da doguwar jiki, daidaitacce tare da ƙaramin ƙoƙon ƙoƙon baya da faɗin kai. Ana samun su a cikin tekuna a duniya kuma suna ciyar da krill, wani nau'in crustacean mai kama da shrimp. Ana ganin jinsin na cikin hadari saboda farauta a baya da kuma ci gaba da barazana kamar sauyin yanayi da gurbatar yanayi.