Any of various grouses of the genus Lagopus, inhabiting arctic, subarctic, and alpine regions of the Northern Hemisphere and having feathered legs and feet and plumage that is brown or gray in summer and white in winter.

• 雷鸟任一种雷鸟属的松鸡，栖息在北极、亚北极和北半球的高山地区，有覆有羽毛的腿和爪，全身羽毛在夏天是棕色或灰色的，在冬天是白色的