grayback
🇬🇧/ˈɡreɪbæk/ 🇺🇸/ˈɡreˌbæk/ 5any of various animals having a grey back, such as the grey whale and the hooded crow 灰背类动物; 如鲸和冠鸦
noun [专属名词]灰色动物；灰鲸；黑头鸦
A term for animals that are dark gray on top and light-colored or white on the bottom, such as the gray whale, alewife, certain whitefish, and some sandpipers.
深灰色动物：指表面为深灰色，底部为浅色或白色的动物，如灰鲸、灰鲱、某些白鱼和一些矶鹞
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