Latherin, a soaplike protein in horse sweat and saliva, helps spread sweat over the coat, maximizing evaporation of water for heat loss, and causing the foam that we see when horses sweat profusely. Latherin is also found in saliva, which might explain the foam often seen around a bitted horse's lips. New research sheds light on this unique feature of equine physiology.

"Horses

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