| | Bubo virginianus virginianus (Gmelin) |
 | | The Dusky Horned Owl (Bubo virgininianus saturatus) is similar to the Pacific Horned Owl but much darker, especially the upper parts; it is found from the interior of Alaska south along the coast to south-central California, and in the Rocky Mountains to Arizona and New Mexico. |
 | | The Arctic Horned Owl (Bubo virginianus subarcticus or Bubo virginianus wapacuthu) is paler than the Western Horned Owl, the upper parts with much more of white and less of fl, andbull the under parts less heavily barred, and the feet paler, usually immaculate buff or buffy white. |
 | | The Labrador Horned Owl (Bubo virginianus heteroclnemis) is similar to the Dusky Horned Owl; but: its bill is larger, its rear under parts lighter, its feet paler and less heavily mottled, and its upper parts usually with less of a tawny admixture. |
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