08/18/2026
Western Screech-Owls (WESOs) are small but highly adaptable owls found throughout western North America, inhabiting a wide variety of environments, from open woodlands and deserts to urban parks and residential areas. They can be difficult to distinguish from the Eastern Screech-Owl, but their distributions, vocalizations, and bill color provide useful clues for ID. Despite its name, the WESO's call is not a typical screech, but a series of notes that resembles a bouncing ball. One of North America’s smallest owls, it is nevertheless capable of hunting an incredibly diverse range of prey, including carpenter ants, crayfish, rodents, and small birds. Its ability to adapt to some human-modified environments has helped it persist in many areas, but it still depends on suitable nesting cavities and habitat features such as mature trees and riparian areas. Other threats include the removal of standing dead trees, which provide important nesting sites, and ongoing habitat alteration. In parts of the West, WESOs face increasing competition from expanding Barred Owl populations, which may affect access to territories and nesting cavities.
Because the Western Screech-Owl is native to western North America, its species-related cultural meanings are best traced through Canada, the United States, and Mexico. In south-central British Columbia, Secwépemc people have regarded screech-owls as messengers and traditionally left them undisturbed. In Mexico, the bird is called tecolote occidental: tecolote derives from the Nahuatl tecolotl, a culturally significant name for owls whose nocturnal calls could signify ominous events, hidden knowledge, or supernatural transformation—beliefs concerning owls broadly rather than this species alone. Interestingly, despite its English name, the Western Screech-Owl usually produces an accelerating series of whistles or trills rather than a true screech, and its voice helped ornithologists distinguish it from the Eastern Screech-Owl.
Artwork and cultural insights provided by Camellia Paul, University of Illinois at Urbana-Champaign