
Mule
Animal Hybrid
Understand that 'mule' refers to a specific animal hybrid and not just any mixed-breed animal.

Crossbreeding a pony and a donkey will not produce a mule.
Workload Carrier
'Mule' highlights the animal's historic role in hauling burdens, making it a metaphor for bearing heavy loads.

He's carrying all our backpacks, our very own mule.
Stubborn Reputation
Mules are famously stubborn, so 'stubborn as a mule' implies great obstinacy.

I tried to change his mind, but he's stubborn as a mule.
Compare with
AssBurroDonkeyJackassSteedWorkhorse
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