Tytonidae consists of 16 living species of barn and bay owls, in which the main difference from true owls is a heart-shaped facial disk. The common barn owl (''Tyto alba'') is the most widely distributed owl species on earth. | Tytonidae consists of 16 living species of barn and bay owls, in which the main difference from true owls is a heart-shaped facial disk. The common barn owl (''Tyto alba'') is the most widely distributed owl species on earth. |