372. Saw-whet owl. Nyctala acadica. Resident; not uncommon; occurs throughout the State below 8,000 feet.
373. Screech owl. Magascops asio. Rare resident; the eastern analogue of the next.
373e. Rocky Mountain screech owl. Magascops asio maxwelliæ. Common resident; found from plains and foothills to about 6,000 feet; rare visitant at nearly 9,000 feet.
373g. Aiken's screech owl. Megascops asio aikeni. Resident; limited to from 5,000 to 9,000 feet.
374. Flammulated screech owl. Megascops flammeola. Rare resident; rarest owl in Colorado, if not in the United States; ten instances of breeding, all in Colorado; twenty-three records in all for the State.
375a. Western horned owl. Bubo virginianus pallescens. Common resident; breeds on the plains and in the mountains.
375b. Arctic horned owl. Bubo virginianus arcticus. Winter visitor; not uncommon; breeds in arctic America.
376. Snowy owl. Nyctea nyctea. Rare winter visitor; occurs on the plains and in the lower foothills; range in summer, extreme northern portions of northern hemisphere.
378. Burrowing owl. Speotyto cunicularia hypogæa. Resident; abundant locally; breeds on plains and up to 9,000 feet.
379. Pygmy owl. Glaucidium gnoma. Resident; rare; favorite home in the mountains; breeds as high as 10,000 feet.