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Measurements of 1,463 Barn Owls Supported a Three-Species Split

Eastern Barn Owl taking flight in Australia
Research · Evolution & taxonomy

A large morphological study of the former barn owl complex found that Western Barn Owl (Tyto alba), American Barn Owl (Tyto furcata) and Eastern Barn Owl (Tyto javanica) differ in body size and wing shape, adding morphological support to the genetic and vocal evidence already used to separate them. The study measured up to 21 traits in 192 live birds and 1,271 museum specimens from across the ranges of the three lineages.

Genomic work had already identified the three as deeply diverged evolutionary units. The new study asked whether their external morphology showed the same broad separation despite substantial geographic variation within each lineage.

American Barn Owls stood out most clearly

When the researchers considered many measurements together, the three groups separated clearly. The weakest separation was between T. alba and T. javanica, which were morphologically closer to each other than either was to T. furcata.

American Barn Owls were the strongest size outlier. Sex for sex, T. furcata was considerably larger than the other two species, especially in wing length. Eastern Barn Owls were somewhat intermediate overall, but individual measurements did not all follow a simple size ladder. The support for three groups therefore came from the overall combination of traits rather than from one measurement that cleanly separated every bird.

Wing shape supported the same broad division

Measurements of the primary feathers also showed the strongest contrasts between American Barn Owls and the other two groups, while Western and Eastern Barn Owls were much less strongly separated. The agreement between overall body measurements and wing shape added independent morphological support to the three-species division.

Because most of the material consisted of museum specimens, the researchers also compared live and preserved birds from the same Pacific Northwest population. Several measurements were smaller in museum skins, but the wing measurements used to describe wing shape were much less affected. This check reduced the risk that preservation effects were being mistaken for taxonomic differences.

The authors conclude that morphology supports and complements the genetic and vocal evidence behind the now widely adopted division of the former Tyto alba sensu lato complex into three species. The study does not replace the genetic evidence; it shows that the same broad evolutionary divisions are also visible in measurable aspects of external form.

Sources and image credit

  1. Daugherty, R. L., Brown, A. J., III, Salas, V. G., Contreras, F. J., Chávez, R., Mendes, G. C., Nestler, J. R., & Johnson, D. H. (2026). Morphological assessment of the Common Barn Owl Tyto alba (Strigiformes: Tytonidae) supports three species. Zootaxa, 5752(3), 399–416.Primary peer-reviewed article published 28 January 2026. The authors measured up to 21 morphometric traits in 192 live and 1,271 museum barn owl specimens representing Tyto alba, T. furcata and T. javanica and found morphological differences supporting their treatment as three species.

Image: Trevor Andersen (Bowerbirdaus) / Wikimedia Commons — eastern barn owl (Tyto javanica) taking flight in Australia; representative species photograph, not one of the owls measured in the 2026 morphology study. · CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ · Source

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