| Lagopus Temporal range: Early Pliocene to present
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Galliformes |
| Family: | Phasianidae |
| Tribe: | Tetraonini |
| Genus: | Lagopus Brisson, 1760 |
| Type species | |
| Tetrao lagopus Linnaeus, 1758
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| Species | |
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See text | |
Lagopus is a genus of birds in the grouse subfamily commonly known as ptarmigans (/ˈtɑːrmɪɡənz/). The genus contains four living species with numerous described subspecies, all living in tundra or cold upland areas.