Why do northern spotted owls have spots on them?

Spotted Owls are dark-brown overall dappled with white. The chest and belly are marked with large, oval white spots. The facial disks are dark brown with pale marks forming an X between the eyes. The Mexican subspecies has a paler facial disk. Researcher's haven't know exactly why the some owls have spots on them, maybe it's inherited, developed, or it may came after birth.

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