Animalia > Chordata > Aves > Strigiformes > Strigidae > Megascops > Megascops asio

Megascops asio (Eastern Screech-Owl; Eastern Screech Owl; petit-duc maculé; Tecolote oriental)

Synonyms: Otus asio

Wikipedia Abstract

The eastern screech owl or eastern screech-owl (Megascops asio) is a small owl that is relatively common in Eastern North America, from Mexico to Canada. This species is native to most wooded environments of its distribution and, more so than any other owl in its range, has adapted well to manmade development, although it frequently avoids detection due to its strictly nocturnal habits.
View Wikipedia Record: Megascops asio


Megascops asio asio (Eastern screech owl)
Megascops asio floridanus (Eastern screech owl)
Megascops asio hasbroucki (Hasbrouck's screech owl)
Megascops asio maxwelliae (Rocky Mountain screech owl)
Megascops asio mccallii (Texas screen owl)

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 7.49056
EDGE Score: 2.13896


Adult Weight [1]  172 grams
Birth Weight [3]  11 grams
Female Weight [1]  184 grams
Male Weight [1]  160 grams
Weight Dimorphism [1]  15 %
Female Maturity [3]  1 year
Male Maturity [3]  1 year
Breeding Habitat [2]  Temperate eastern forests, Tropical dry forests
Wintering Geography [2]  Non-migrartory
Wintering Habitat [2]  Temperate eastern forests, Tropical dry forests
Diet [4]  Carnivore (Invertebrates), Carnivore (Vertebrates)
Diet - Invertibrates [4]  50 %
Diet - Vertibrates [4]  50 %
Forages - Mid-High [4]  10 %
Forages - Understory [4]  10 %
Forages - Ground [4]  70 %
Forages - Water Surface [4]  10 %
Clutch Size [5]  4
Clutches / Year [3]  1
Global Population (2017 est.) [2]  710,000
Incubation [3]  29 days
Maximum Longevity [3]  21 years
Nocturnal [4]  Yes


Name Countries Ecozone Biome Species Report Climate Land
Allegheny Highlands forests United States Nearctic Temperate Broadleaf and Mixed Forests
Appalachian mixed mesophytic forests United States Nearctic Temperate Broadleaf and Mixed Forests
Appalachian-Blue Ridge forests United States Nearctic Temperate Broadleaf and Mixed Forests
Atlantic coastal pine barrens United States Nearctic Temperate Coniferous Forests  
Canadian Aspen forests and parklands Canada Nearctic Temperate Grasslands, Savannas, and Shrublands
Central and Southern mixed grasslands United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Central forest-grasslands transition United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Central tall grasslands United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Central U.S. hardwood forests United States Nearctic Temperate Broadleaf and Mixed Forests
East Central Texas forests United States Nearctic Temperate Broadleaf and Mixed Forests
Eastern forest-boreal transition Canada, United States Nearctic Temperate Broadleaf and Mixed Forests
Eastern Great Lakes lowland forests Canada, United States Nearctic Temperate Broadleaf and Mixed Forests
Edwards Plateau savanna United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Everglades United States Neotropic Flooded Grasslands and Savannas
Flint Hills tall grasslands United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Florida sand pine scrub United States Nearctic Temperate Coniferous Forests
Middle Atlantic coastal forests United States Nearctic Temperate Coniferous Forests
Mississippi lowland forests United States Nearctic Temperate Broadleaf and Mixed Forests
Nebraska Sand Hills mixed grasslands United States Nearctic Temperate Grasslands, Savannas, and Shrublands
New England-Acadian forests Canada, United States Nearctic Temperate Broadleaf and Mixed Forests
Northeastern coastal forests United States Nearctic Temperate Broadleaf and Mixed Forests
Northern mixed grasslands Canada, United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Northern short grasslands Canada, United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Northern tall grasslands Canada, United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Ozark Mountain forests United States Nearctic Temperate Broadleaf and Mixed Forests
Piney Woods forests United States Nearctic Temperate Coniferous Forests
South Florida rocklands United States Neotropic Tropical and Subtropical Moist Broadleaf Forests
Southeastern conifer forests United States Nearctic Temperate Coniferous Forests
Southeastern mixed forests United States Nearctic Temperate Broadleaf and Mixed Forests
Southern Great Lakes forests Canada, United States Nearctic Temperate Broadleaf and Mixed Forests
Tamaulipan matorral Mexico Nearctic Deserts and Xeric Shrublands
Tamaulipan mezquital Mexico, United States Nearctic Deserts and Xeric Shrublands
Texas blackland prairies United States Nearctic Temperate Grasslands, Savannas, and Shrublands
Upper Midwest forest-savanna transition United States Nearctic Temperate Broadleaf and Mixed Forests
Western Great Lakes forests Canada, United States Nearctic Temperate Broadleaf and Mixed Forests
Western Gulf Coastal grasslands Mexico, United States Nearctic Tropical and Subtropical Grasslands, Savannas, and Shrublands  
Western short grasslands United States Nearctic Temperate Grasslands, Savannas, and Shrublands

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Algonquin Provincial Park IV 1868802 Ontario, Canada
Antietam National Battlefield III 3263 Maryland, United States
Arkansas Post National Memorial National Monument V 424 Arkansas, United States
Assateague Island National Seashore II 8621 Maryland, United States
Badlands National Park II 178535 South Dakota, United States
Big Bend Biosphere Reserve National Park II 815561 Texas, United States
Big Cypress National Preserve V 732120 Florida, United States
Big Thicket Biosphere Reserve National Park II 616880 Texas, United States
Biscayne National Park II 11085 Florida, United States
Blackbeard Island National Wildlife Refuge IV 4842 Georgia, United States
Blackwater National Wildlife Refuge VI 19192 Maryland, United States
Bombay Hook National Wildlife Refuge VI 16363 Delaware, United States
Buffalo National River National River and Wild and Scenic Riverway V 59947 Arkansas, United States
California Coast Ranges Biosphere Reserve 153447 California, United States  
Calvin College Ecosystem Preserve 90 Michigan, United States
Canaveral National Seashore II 9090 Florida, United States
Cape Cod National Seashore II 21724 Massachusetts, United States
Cape Hatteras National Seashore II 21476 North Carolina, United States
Cape Romain National Wildlife Refuge IV 8964 South Carolina, United States
Carl Sandburg Home National Hist. Site National Historic Site III 271 North Carolina, United States
Carolinian-South Atlantic Biosphere Reserve 310228 North Carolina, South Carolina, Georgia, United States      
Cascade Head Biosphere Reserve 17423 Oregon, United States
Catoctin Mountain Park National Park II 5994 Maryland, United States
Central Gulf Coastal Plain Biosphere Reserve 40530 United States  
Central Plains Biosphere Reserve 15345 United States  
Champlain-Adirondack Biosphere Reserve 9859505 New York, Vermont, United States  
Chattahoochee River National Recreation Area V 7622 Georgia, United States
Chesapeake & Ohio Canal National Hist. Park National Historical Park V 19586 Maryland, District of Columbia, United States
Chickasaw National Recreation Area V 7025 Oklahoma, United States
Chiricahua National Monument V 1421 Arizona, United States
Colonial National Historic Park National Historical Park V 9316 Virginia, United States
Congaree Swamp National Park II 6095 South Carolina, United States
Crater Lake National Park II 180091 Oregon, United States
Crosswinds Marsh Nature Preserve 1050 Michigan, United States
Cumberland Island National Seashore II 20629 Georgia, United States
Cuyahoga Valley National Park II 24907 Ohio, United States
De Soto National Wildlife Refuge IV 8007 Iowa, Nebraska, United States
Devils Tower National Monument V 1361 Wyoming, United States
Edwin S. George Reserve 1297 Michigan, United States
Effigy Mounds National Monument V 1296 Iowa, United States
Felsenthal National Wildlife Refuge VI 66133 Arkansas, United States
Florida Keys National Marine Sanctuary IV 2387149 Florida, United States
Fort Caroline National Memorial III 137 Florida, United States
Fort Matanzas National Monument III 269 Florida, United States
Fort Pulaski National Monument V 4213 Georgia, United States
Friendship Hill National Historic Site III 697 Pennsylvania, United States
George Washington Birthplace National Monument V 435 Virginia, United States
Great Smoky Mountains National Park II 515454 North Carolina, Tennessee, United States
Great Swamp National Wildlife Refuge VI 3161 New Jersey, United States
Guilford Courthouse National Military Park V 216 North Carolina, United States
Harpers Ferry National Historical Park VI 715 West Virginia, United States
Horicon National Wildlife Refuge IV 21369 Wisconsin, United States
Horseshoe Bend National Military Park V 1926 Alabama, United States
Hot Springs National Park II 5740 Arkansas, United States
Jean Lafitte National Hist. Park & Preserve National Historical Park II 17686 Louisiana, United States
Knife River Indian Villages National Hist. Site National Historic Site III 1756 North Dakota, United States
Konza Prairie Biosphere Reserve 8617 Kansas, United States  
Lacassine National Wildlife Refuge VI 28351 Louisiana, United States
Land Between the Lakes Biosphere Reserve V 166264 Kentucky, Tennessee, United States
Landels-Hill Big Creek Preserve Nature Conservancy - Preserve Ia 45 California, United States
Lassen Volcanic National Park II 29388 California, United States
Long Point Biosphere Reserve 100325 Ontario, Canada  
Mammoth Cave Area Biosphere Reserve (Natn'l Park) National Park II 51235 Kentucky, United States
Manassas National Battlefield Park III 5132 Virginia, United States
Morristown National Historical Park VI 1677 New Jersey, United States
Mount Rainier National Park II 235186 Washington, United States
New River Gorge National River National River and Wild and Scenic Riverway V 55591 West Virginia, United States
Nez Perce National Historical Park V 2076 Idaho, United States
Niagara Escarpment Biosphere Reserve 470167 Ontario, Canada  
Oak Ridge National Environmental Research Park 20001 Tennessee, United States
Obed Wild and Scenic River National River and Wild and Scenic Riverway V 5268 Tennessee, United States
Ocmulgee National Monument V 693 Georgia, United States
Okefenokee National Wildlife Refuge IV 38256 Florida, United States
Organ Pipe Cactus Biosphere Reserve 327376 Arizona, United States  
Ozark National Scenic Riverways National River and Wild and Scenic Riverway V 54621 Missouri, United States
Point Pelee National Park II 5764 Ontario, Canada
Reserva de la Biosfera El Cielo Biosphere Reserve 353161 Mexico  
Reserva de la Biosfera Sierra Gorda Biosphere Reserve VI 955579 Queretaro, Mexico  
Reserva de la Michilia Biosphere Reserve VI 23405 Durango, Mexico  
Riding Mountain Biosphere Reserve II 762028 Manitoba, Canada
Rocky Mountain Biosphere Reserve II 239938 Colorado, United States
Rondeau Provincial Park II 5035 Ontario, Canada
Salt Plains National Wildlife Refuge VI 23844 Oklahoma, United States
San Juan Island National Historical Park III 1674 Washington, United States
Saratoga National Historical Park   New York, United States
Shenandoah National Park II 108221 Virginia, United States
Sleeping Bear Dunes National Lakeshore II 62563 Michigan, United States
South Atlantic Coastal Plain Biosphere Reserve 20317 South Carolina, United States  
Southern Appalachian Biosphere Reserve 37548505 North Carolina, Tennessee, United States  
Stones River National Battlefield III 518 Tennessee, United States
Tawas Point State Park 183 Michigan, United States
Upper Miss. River Nat'l Wildlife Refuge National Wildlife Refuge VI 25823 Illinois, Iowa, Wisconsin, United States
Valley Forge National Historical Park VI 3509 Pennsylvania, United States
Vicksburg National Military Park V 1651 Mississippi, United States
Virginia Coast Biosphere Reserve 33386 Virginia, United States  
Western Michigan University's Asylum Lake Preserve 274 Michigan, United States
Wheeler National Wildlife Refuge IV 26618 Alabama, United States
Wilson's Creek National Battlefield V   Missouri, United States
Wind Cave National Park II 29471 South Dakota, United States
Yellowstone Biosphere Reserve II 2196863 Idaho, Montana, Wyoming, United States

Prey / Diet

Baeolophus bicolor (Tufted Titmouse)[6]
Blarina brevicauda (Northern Short-tailed Shrew)[7]
Blarina carolinensis (Southern Short-tailed Shrew)[8]
Bombycilla cedrorum (Cedar Waxwing)[6]
Columba livia (Rock Pigeon)[6]
Condylura cristata (Star-nosed Mole)[6]
Cryptotis parva (North American Least Shrew)[6]
Cyanocitta cristata (Blue Jay)[6]
Diadophis punctatus (Ringneck Snake)[6]
Glaucomys volans (southern flying squirrel)[6]
Haemorhous mexicanus (House Finch)[6]
Junco hyemalis (Dark-eyed Junco)[6]
Lanius excubitor (Northern Shrike)[6]
Lasiurus borealis (red bat)[6]
Leiothlypis peregrina (Tennessee Warbler)[6]
Lithobates pipiens (Northern Leopard Frog)[6]
Lithobates sylvaticus (Wood Frog)[6]
Luxilus chrysocephalus (Striped shiner)[6]
Melanerpes erythrocephalus (Red-headed Woodpecker)[9]
Microtus ochrogaster (prairie vole)[6]
Microtus pennsylvanicus (meadow vole)[6]
Microtus pinetorum (woodland vole)[10]
Mus musculus (house mouse)[6]
Myotis lucifugus (little brown myotis)[6]
Myotis sodalis (Indiana bat)[11]
Napaeozapus insignis (woodland jumping mouse)[12]
Passer domesticus (House Sparrow)[6]
Passerella iliaca (Fox Sparrow)[6]
Perimyotis subflavus subflavus (eastern pipistrelle)[6]
Peromyscus leucopus (white-footed mouse)[6]
Peromyscus maniculatus (deer mouse)[6]
Picoides pubescens (Downy Woodpecker)[6]
Picoides villosus (Hairy Woodpecker)[6]
Pinicola enucleator (Pine Grosbeak)[6]
Poecile atricapillus (Black-capped Chickadee)[6]
Quiscalus quiscula (Common Grackle)[6]
Rallus limicola (Virginia Rail)[6]
Rattus norvegicus (Norway rat)[6]
Reithrodontomys humulis (eastern harvest mouse)[6]
Sciurus carolinensis (eastern gray squirrel)[6]
Sciurus vulgaris (Eurasian red squirrel)[6]
Setophaga coronata (Yellow-rumped Warbler)[6]
Setophaga petechia (Yellow Warbler)[6]
Sialia sialis (Eastern Bluebird)[6]
Sitta carolinensis (White-breasted Nuthatch)[6]
Sorex cinereus (masked shrew)[6]
Spinus tristis (American Goldfinch)[6]
Sturnus vulgaris (European Starling)[6]
Sylvilagus floridanus (Eastern Cottontail)[6]
Tamias striatus (eastern chipmunk)[6]
Tamiasciurus hudsonicus (red squirrel)[6]
Troglodytes aedon (House Wren)[6]
Turdus migratorius (American Robin)[6]
Zenaida macroura (Mourning Dove)[6]
Zonotrichia albicollis (White-throated Sparrow)[6]

Prey / Diet Overlap

Competing SpeciesCommon Prey Count
Accipiter cooperii (Cooper's Hawk)2
Aegolius acadicus (Northern Saw-whet Owl)1
Agkistrodon contortrix (Southern Copperhead)4
Agkistrodon piscivorus (conanti)1
Asio flammeus (Short-eared Owl)3
Asio otus (Long-eared Owl)3
Bubo virginianus (Great Horned Owl)2
Buteo jamaicensis (Red-tailed Hawk)1
Buteo lineatus (Red-shouldered Hawk)1
Buteo platypterus (Broad-winged Hawk)1
Canis latrans (Coyote)1
Circus cyaneus (Northern Harrier)1
Coluber flagellum (Coachwhip)1
Crotalus horridus (Timber rattlesnake (atricaudatus))3
Didelphis marsupialis (Common Opossum)1
Falco peregrinus (Peregrine Falcon)1
Lampropeltis calligaster (Prairie Kingsnake)1
Lynx rufus (Bobcat)1
Mephitis mephitis (Striped Skunk)1
Neovison vison (American Mink)2
Pituophis melanoleucus (Eastern Pine Snake)1
Strix varia (Barred Owl)2
Tyto alba (Barn Owl)2
Urocyon cinereoargenteus (Gray Fox)1
Vulpes vulpes (Red Fox)2


Accipiter cooperii (Cooper's Hawk)[6]
Bassariscus astutus (Ringtail)[6]
Bubo virginianus (Great Horned Owl)[6]
Buteo albonotatus (Zone-tailed Hawk)[6]
Didelphis virginiana (Virginia Opossum)[6]
Pantherophis obsoletus (Western Rat Snake)[6]
Procyon lotor (Raccoon)[6]
Strix varia (Barred Owl)[6]


Parasitized by 
Centrorhynchus conspectus[13]
Centrorhynchus spinosus[13]
Ceratophyllus niger (Western chicken flea)[14]
Choanotaenia speotytonis <Unverified Name>[13]
Dispharynx nasuta <Unverified Name>[13]
Excisa excisiformis <Unverified Name>[13]
Megabothris asio asio[14]
Neodiplostomum americanum <Unverified Name>[13]
Neodiplostomum reflexum <Unverified Name>[13]
Physocephalus sexalatus[13]
Plagiorchis speotyonis <Unverified Name>[13]
Subulura reclinata <Unverified Name>[13]

Institutions (Zoos, etc.)

Institution Infraspecies / Breed 
Abilene Zoological Gardens
Alexandria Zoological Park
Assiniboine Park Zoomaxwelliae
Audubon Zoo
Bay Beach Wildlife Sanctuary
Bergen County Zoological Park
Binder Park Zoo
Binghamton Zoo at Ross Park
Birmingham Zoo
Blank Park Zoo of Des Moines
Boonshoft Museum of Discovery
BREC's Baton Rouge Zoo
Bronx Children's Zoo
Bronx Zoo/Wildlife Conservat'n Society
Buttonwood Park Zoofloridanus
Cameron Park Zoo
Capron Park Zoo
Central Florida Zoological Park
Chehaw Wild Animal Park
Chicago Zoological Park
Cincinnati Zoo & Botanical Garden
Cleveland Metroparks Zoo
Columbian Park Zoo
Columbus Zoo and Aquarium
Connecticut's Beardsley Zooasio
Cosley Zooasio
Dallas World Aquarium
David Traylor Zoo of Emporia
Dickerson Park Zoo
Disney's Animal Kingdom
El Paso Zoo
Ellen Trout Zoo
Erie Zoological Gardens
Florida Aquarium
Fort Wayne Children's Zoo
Fort Worth Zoological Park
Gladys Porter Zoo
Great Plains Zoo
Henson Robinson Zoo
Homosassa Springs Wildlife State Park
Houston Zoo, Inc.
Hutchinson Zoo
Indianapolis Zoo
Jackson Zoological Park
Jacksonville Zoo and Gardens
John Ball Zoological Garden
Knoxville Zoological Gardens
Lake Superior Zoological Gardens
Lee Richardson Zoo
Lehigh Valley Zoo
Lincoln Park Zoological Gardens
Little Rock Zoological Gardens
Louisville Zoological Garden
Maryland Zoo in Baltimore
Memphis Zoological Garden & Aquarium
Mesker Park Zoo
Miami Metrozoo
Mill Mountain Zoo
Miller Park Zoo
Moonridge Animal Park
Museum of Science - Live Animal Center
Nashville Zoo at Grassmere
National Aviary in Pittsburghasio
Natural History Museum of Adirondacks
Natural Science Center of Greensboro
Newport Aquarium
North Carolina Zoological Park
Oatland Island Wildlife Center
Oklahoma City Zoological Park
Omaha's Henry Doorly Zoo
Peoria Zoo in Glen Oak Park
Pittsburgh Zoo & PPG Aquarium
Point Defiance Zoo & Aquarium
Potter Park Zoological Gardens
Prospect Park Zoo
Red River Zoo
Roger Williams Park Zoo
Rosamond Gifford Zoo at Burnet Park
Saint Louis Zoological Park
Salisbury Zoological Park
San Antonio Zoological Gardens & Aquar
Scovill Zoo
Silver Springs Park
St. Augustine Alligator Farm
Sunset Zoo
Tallahassee Museum of History and
Tampa's Lowry Park Zoo
Tennessee Aquarium
Texas Zoo
The Naples Zoo
The Philadelphia Zooasio
Toledo Zoological Gardens
Trevor Zoo at Millbrook School
Tulsa Zoo & Living Museum
Turtle Back Zoo
Utah's Hogle Zoo
Utica Zoo
Virginia Aquarium&Marine Science Ctr
Virginia Living Museumasio
Virginia Zoological Parkasio
Wildlife Safari Inc
Zoo New England, Stone Zooasio
ZooAmerica (No. American Wildlife Pk.)

Range Map

Little River National Wildlife Refuge; Saint Croix International Historic Site; Western Michigan University’s Asylum Lake;


Play / PauseVolume
Provided by Center for Biological Diversity via Myxer Author: Tony Phillips / SUNY Stony Brook



Attributes / relations provided by
1Kemp, AC. 1989. Estimation of Biological Indices for Little-known African Owls Meyburg, B.-U & R. D. Chancellor eds. 1989 Raptors in the Modern World WWGBP: Berlin, London & Paris
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
4Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
5Jetz W, Sekercioglu CH, Böhning-Gaese K (2008) The Worldwide Variation in Avian Clutch Size across Species and Space PLoS Biol 6(12): e303. doi:10.1371/journal.pbio.0060303
6Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
7Blarina brevicauda, Sarah B. George, Jerry R. Choate, and Hugh H. Genoways, MAMMALIAN SPECIES No. 261, pp. 1-9 (1986)
8Blarina carolinensis, Timothy S. McCay, MAMMALIAN SPECIES No. 673, pp. 1–7 (2001)
9Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at
10Microtus pinetorum, Michael J. Smolen, Mammalian Species No. 147, pp. 1-7 (1981)
11Myotis sodalis, Christine E. Thomson, Mammalian Species No. 163, pp. 1-5 (1982)
12Napaeozapus insignis, John O. Whitaker, Jr., and Robert E. Wrigley, MAMMALIAN SPECIES No. 14, pp. 1-6 (1972)
13Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
14International Flea Database
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 WWF WildFINDER
Protected Areas provided by Biological Inventories of the World's Protected Areas in cooperation between the Information Center for the Environment at the University of California, Davis and numerous collaborators.
Calvin College Ecosystem Preserve
Crosswinds Marsh, Wayne County, Michigan
Edwin S. George Reserve, University of Michigan, Department of Ecology and Evolutionary Biology
Tawas Point State Park
Western Michigan University’s Asylum Lake
Images provided by Google Image Search
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access
Audio software provided by SoundManager 2