Randolph B. Marcy,
The Prairie Traveller, a Hand-book for Overland Expeditions…
(1859)
“ If she happen to have a colt by her side, this is no objection, as the mules soon form the most devoted attachment to it. I have often seen them leave their grazing when very hungry, and flock around a small colt, manifesting their delight by rubbing it with their noses, licking it with their tongues, kicking up their heels, and making a variety of other grotesque demonstrations of affection, while the poor little colt, perfectly unconscious of the cause of these ungainly caresses, stood trembling with fear, but unable to make his escape from the compact circle of his mulish admirers. ”
