- 13.8–17.3 in
- 23.6–25.6 in
- 15.2–28.6 oz
- Willow Grouse (British), Red Grouse (part)
- Le Lagopéde des saules (French)
- The subspecies of Willow Ptarmigan living in Great Britain is known as the "Red Grouse." It does not change its coloring in the winter, but remains entirely reddish brown throughout the year.
- The Willow Ptarmigan is the only grouse in the world in which the male is regularly involved in parental care. Pairs remain together from the beginning of the breeding season until their chicks are independent.
Open tundra, especially in areas heavily vegetated with grasses, mosses, herbs, and shrubs, less frequently in openings in boreal coniferous forest.
- Clutch Size
- 4–14 eggs
- Condition at Hatching
- Completely covered with dense down, eyes open. Leave nest within six to 12 hours after the last egg hatches.
Willow Ptarmigan is common and widespread. Partners in Flight estimates a global breeding population of of 50 million, with 24% spending part of the year in Canada, and 18% in the U.S. This is a U.S.-Canada Stewardship species and rates an 8 out of 20 on the Continental Concern Score. It is not on the 2014 State of the Birds Watch List.
- Hannon, S. J., P. K. Eason, and K. Martin. 1998. Willow Ptarmigan (Lagopus lagopus). In The Birds of North America, No. 369 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA.
- North American Bird Conservation Initiative, U.S. Committee. 2014. State of the Birds 2014 Report. U.S. Department of Interior, Washington, DC.
- Partners in Flight. 2012. Species assessment database.