Asioids

Asioids is an informal term used in some ornithological writings to refer to a subset of owls associated with the genus Asio and its close relatives. The best-known members are the long-eared owl (Asio otus) and the short-eared owl (Asio flammeus). The designation is not a formal taxonomic rank, and different authorities differ on which species are included. In modern classifications, Asio is typically treated as a genus within the family Strigidae, with the label “asioids” not universally used.

Asioid owls are generally medium-sized, nocturnal birds with a rounded facial disk. Features such as ear tufts are variable among species, and plumage tends to be cryptic to blend with their habitats. They are skilled hunters of small mammals and occasionally birds, often pursuing prey under dusk or night conditions. Nesting sites vary, including tree cavities, abandoned nests, and other sheltered locations. Vocalizations are species-specific and commonly used for identification in the field.

Geographic distribution of asioids spans temperate regions of North America and Eurasia, with habitats that include open woodlands, grasslands, marsh edges, and other edge environments where cover and visibility balance for hunting exist. Range and abundance can be patchy, influenced by prey density and habitat availability.

In summary, asioids refer to an informal grouping linked to Asio owls; their use as a taxonomic label is not standardized, and most authorities prefer treating Asio as a distinct genus within Strigidae.