Highland Grouse That Changes Its Plumage
Puzzle 19 of Nordic Connections Hard Pack
Question is: Highland Grouse That Changes Its Plumage
and the answer is: PTARMIGAN
Word Meaning:
PTARMIGAN — Any of three species of small grouse in the genus Lagopus found in subarctic tundra areas of North America and Eurasia.
Definitions from Wiktionary.