Snowy
http://www.enchantedlearning.com/subjects/birds/printouts/Snowyowlprintout.shtml
Great Horned
http://www.enchantedlearning.com/subjects/birds/printouts/Hornedowlprintout.shtml
Western Spotted
http://www.enchantedlearning.com/subjects/birds/printouts/Spottedowlprintout.shtml