ptarmigan/ˈtɑ:mɪgən; `tɑrməɡən/ nbird of the grouse family, with black or grey feathers in summer and white feathers in winter 雷鸟（松鸡科鸟, 夏季羽毛呈黑色或灰色, 冬季呈白色）.
牛津英汉双解词典