At just 8 inches in length, the Northern Saw-whet Owl is one of the smallest owl species in North America. Like most owls, this species possesses short legs, rounded wings, large yellow eyes, and a disk-shaped face. Apart from its small size, it may best be identified by its brown body spotted with white above and streaked below as well as on the face. The Northern Saw-whet Owl primarily breeds in Southern Canada and the northern tier of the United States. Breeding populations also exist at higher elevations in the western U.S.and in the Blue Ridge and Great Smoky Mountains in the southeast. During the winter, this species expands its range southward and into lower elevations, including the coastal southeast, the Great Plains, and the southwest. The Northern Saw-whet Owl inhabits forests across the northern part of the continent. In particular, this owl prefers forests that are composed either entirely of evergreen trees or of a mix of evergreen and deciduous tree species. In winter, individuals which have moved south are less tied to a particular habitat type, relocating as new sources of prey become available. Like most owls, the Northern Saw-whet Owl hunts small mammals, including mice, shrews, and voles. This owl uses its excellent hearing to locate prey on the ground in order to fly down and capture it with its talons. Also, like most owls, this species hunts almost exclusively at night, making it difficult to observe. Northern Saw-whet Owls are most visible roosting high in trees during the day or while producing toot-like calls at dusk.
- Rasmussen, Justin Lee, Spencer G. Sealy and Richard J. Cannings. 2008. Northern Saw-whet Owl (Aegolius acadicus), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/042
- Peterson, Roger Tory. Birds of Eastern and Central North America. Boston: Houghton Mifflin, 1980. Print.
- eBird Range Map - Northern Saw-whet Owl. eBird. Cornell Lab of Ornithology, N.d. Web. 20 July 2012. http://ebird.org/ebird/map/nswowl.
- Aegolius acadicus. Xeno-canto. Xeno-canto Foundation, n.d. Web. 20 July 2012. http://xeno-canto.org/browse.php?query=Aegolius+acadicus.
- Northern Saw-whet Owl (Aegolius acadicus). The Internet Bird Collection. Lynx Edicions, n.d. Web. 20 July 2012. http://ibc.lynxeds.com/species/northern-saw-whet-owl-aegolius-acadicus.