North American term for willow grouse.
- Included in this family of birds is the grouse species, among its subspecies being Lagopus lagopus scoticus, the red grouse of Britain, and Lagopus lagopus lagopus, the willow grouse, known in North America as the willow ptarmigan.
- The ptarmigan feather did not match rock ptarmigan or willow ptarmigan in size of feather, coloration of rachis, or morphology of the dorsal grooved rachis of the outer primary.
- The behaviour we observed was similar to the behaviour of polar bears hunting seals and willow ptarmigan.
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