The long-eared owl is a master of sound, hunting in total darkness with ease.

Nature · Published 30 September 2026 Swipe more like this →

In short: With ears placed asymmetrically on its skull, the long-eared owl can pinpoint prey with ten times the auditory sensitivity of a human. This nocturnal hunter, often found in dense woodland edges, is one of the most widely distributed owl species, yet it remains a master of stealthy, erratic flight.

The long-eared owl (Asio otus) is a medium-sized bird of prey with a vast range spanning Europe, the Palearctic, and North America. Despite its name, the erectile ear-tufts are not for hearing; they are likely tools for intraspecies communication. True hearing is managed by large, asymmetrical ear slits that allow the owl to process sound from both above and below. This specialized anatomy, combined with a well-developed facial disc, makes the species a highly effective nocturnal predator, primarily targeting small rodents like voles.

Taxonomically, the species is part of the genus Asio, which includes eight species worldwide. Genetic studies have revealed that the long-eared owl is surprisingly distant from the short-eared owl, despite their superficial similarities. It is part of a complex that includes tropical relatives like the Madagascar owl (Asio madagascariensis) and the Abyssinian owl (Asio abyssinicus). While fossil records of Asio species exist from prehistory in places like Idaho and California, the exact evolutionary origin of the long-eared owl remains unknown.

The species exhibits significant regional variation, with four recognized subspecies. The nominate race, A. o. otus, ranges from the British Isles to Japan, while others like A. o. canariensis are endemic to the Canary Islands. Interestingly, the species displays reverse sexual dimorphism, where females are typically larger than males. Research in Finland showed males averaging 288 grams and females 327 grams. While the species is currently classified as least concern by the IUCN due to its broad distribution, researchers have detected strong population declines in several parts of its range.

Beyond its physical traits, the long-eared owl is noted for its vocal diversity. In Michigan, observers recorded 23 distinct vocalizations, leading some experts to consider them the most diverse vocalists among Northern Hemisphere owls. Their song, a deep whoop, can travel up to two kilometers on calm nights. Unlike many other owls, they are not strongly territorial and often share communal roosts, reflecting a nomadic or partially migratory lifestyle that allows them to adapt to varying prey availability across their extensive global habitat.

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