Peppermint Narwhal Creative - Happy Mule Day! The phrase "stubborn as a mule" was likely coined by someone not familiar with positive reinforcement training. Ever wonder what is a mule? A Mule
University of Central Missouri - Happy National Mule Day! As we prepare for Homecoming weekend, we're proud to celebrate our strong, hard working and intelligent Mules and Jennies! #AlwaysAMule | Facebook
Donkey Cartoon Vector Drawing Illustration Domestic Funny Calm Mule Happiness Friendly Calm Stock Illustration - Download Image Now - iStock
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