Additional Items of Interest:

• Can't get enough? Here's some more photos that will make you smile!!!
• Really great reference for any colic questions

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Sources:

• The Flehmen Response in Horses
• Crucial colic cues
• Flehmen definition
• P.L Senger. "Pathways to pregnancy and parturition." 3rd Edition.

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Journal Articles Used:

• Cathi C. Stahlbaum, Houpt, Katherine A. "The role of the flehmen response in the behavioral repertoire of the Stallion." Physiology & Behavior. Vol 45. pp 1207-1214. Online
• Sharon Crowell-Davis, Houpt, Katherine A. "The ontogeny of flehmen in horses." Animal Behavior. Vol 33. pp 739-745. Online