The plumage on its underbelly and wings is gleaming white, an unusual trait that in theory should make it more difficult for the owl ... color, but earlier research had suggested that whiter barn ...

Yet, freezing duration varied by barn owl plumage color and moon condition ... Délachaux & Niestlé. 328 pages. Roulin A. 2022. Die Schleiereule — Evolution und ökologie.