Ga'Hoole Bird Size Comparison by FantasyFanatic365 on DeviantArt

Books on Guardians-Of-GaHoole - DeviantArt

Demon ducks - Dromornithids by artbyjrc on DeviantArt

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Ga'Hoole Fancomic Page 3 by bird-cult on DeviantArt

Tyto species chart by busbyart on DeviantArt

Facility owls by Vanzkie on DeviantArt

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Barn Owl Reference 9 by FantasyFanatic365 on DeviantArt

Books on Guardians-Of-GaHoole - DeviantArt