N.A. Checklist

Scientific Name

Barn Owl - Tyto alba
Barred Owl - Strix varia
Boreal Owl - Aegolius funereus
Burrowing Owl - Athene cunicularia
Eastern Screech-Owl - Megascops (Otus) asio
Elf Owl - Micrathene whitneyi
Ferruginous Pygmy-Owl - Glaucidium brasilianum
Flammulated Owl - Otus flammeolus
Great Gray Owl - Strix nebulosa
Great Horned Owl - Bubo virginianus
Long-eared Owl - Asio otus
Mountain Pygmy-Owl - Glaucidium gnoma
Northern Hawk Owl - Surnia ulula
Northern Pygmy-Owl - Glaucidium californicum
Northern Saw-whet Owl - Aegolius acadicus
Short-eared Owl - Asio flammeus
Snowy Owl - Bubo scandiaca
Spotted Owl - Strix occidentalis
Western Screech-Owl - Megascops (Otus) kennicottii
Whiskered Screech-Owl - Megascops (Otus) trichopsis

Aegolius acadicus - Northern Saw-whet Owl
Aegolius funereus - Boreal Owl
Asio flammeus - Short-eared Owl
Asio otus - Long-eared Owl
Athene cunicularia - Burrowing Owl
Bubo virginianus - Great Horned Owl
Bubo scandiaca - Snowy Owl
Glaucidium brasilianum - Ferruginous Pygmy-Owl
Glaucidium californicum - Northern Pygmy-Owl
Glaucidium gnoma - Mountain Pygmy-Owl
Megascops (Otus) asio - Eastern Screech-Owl
Megascops (Otus) kennicottii - Western Screech-Owl
Megascops (Otus) trichopsis - Whiskered Screech-Owl
Micrathene whitneyi - Elf Owl
Otus flammeolus - Flammulated Owl
Strix nebulosa - Great Gray Owl
Strix occidentalis - Spotted Owl
Strix varia - Barred Owl
Surnia ulula - Northern Hawk Owl
Tyto alba - Barn Owl

Taxonomic

Size (largest to smallest)

Tyto alba - Barn Owl
Otus flammeolus - Flammulated Owl
Megascops (Otus) asio - Eastern Screech-Owl
Megascops (Otus) kennicottii - Western Screech-Owl
Megascops (Otus) trichopsis - Whiskered Screech-Owl
Bubo virginianus - Great Horned Owl
Strix nebulosa - Great Gray Owl
Asio otus - Long-eared Owl
Asio flammeus - Short-eared Owl
Bubo scandiaca - Snowy Owl
Strix occidentalis - Spotted Owl
Strix varia - Barred Owl
Athene cunicularia - Burrowing Owl
Surnia ulula - Northern Hawk Owl
Aegolius funereus - Boreal Owl
Aegolius acadicus - Northern Saw-whet Owl
Glaucidium californicum - Northern Pygmy-Owl
Glaucidium gnoma - Mountain Pygmy-Owl
Glaucidium brasilianum - Ferruginous Pygmy-Owl
Micrathene whitneyi - Elf Owl

Great Gray Owl - S. nebulosa (24-33 in.)
Snowy Owl - B. scandiaca (20-27 in.)
Great Horned Owl - B. virginianus (18-25 in.)
Barred Owl - S. varia (19-21 in.)
Spotted Owl - S. occidentalis (16.5-19 in.)
Northern Hawk Owl - S. ulula (14-17.5 in.)
Short-eared Owl - A. flammeus (15-17 in.)
Barn Owl - T. alba (14-16 in.)
Long-eared Owl - A. otus (13-16 in.)
Burrowing Owl - A. cunicularia (9-11 in.)
Boreal Owl - A. funereus (8.5-12 in.)
Northern Saw-whet Owl - A. acadicus (7-8.5 in.)
Western Screech-Owl - M. kennicottii (8.25-9.5 in.)
Eastern Screech-Owl - M. asio (8-9 in.)
Ferruginous Pygmy-Owl - G. brasilianum (6.5-7in.)
Whiskered Screech-Owl - M. trichopsis (6.3-7.5 in.)
Northern Pygmy-Owl - G. californicum (6.3-7 in.)
Flammulated Owl - O. flammeolus (5.9-6.7 in.)
Mountain Pygmy-Owl - G. gnoma (5.9-6.5 in.)
Elf Owl - M. whitneyi (5.1-5.5 in.)