A hazel hen is a type of wild bird, also called a hazel grouse or wood grouse, found in European forests.
Compound word from 'hazel' (the tree/shrub where they frequent) plus 'hen' (female bird), descriptively named for the birds' habitat.
Hazel hens were once hunted extensively across Europe, but now they're protected—the word itself is a fossil reminder of when European forests were so thick with game that simple compound names described entire ecosystems.
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