the.com/mule
the genetic dead-end that out-thinks, out-lasts, and out-stubborns every purebred parent it has
means A hybrid animal, the sterile offspring of a male donkey and a female horse, prized as a tough, sure-footed pack and work animal — and, by extension, a person or thing that's stubbornly immovable.
from From Latin 'mulus,' the donkey-horse hybrid, carried into Old English and English largely unchanged. The word later branched out the way the animal works: a 'mule' became a backless slipper (from French 'mule,' likely the same Latin root by way of a Roman word for a kind of shoe), and in the drug trade a 'mule' is someone who hauls contraband — both senses leaning on the beast's reputation as a patient, burdened carrier. The 'stubborn as a mule' sense is folk wisdom turned idiom, fair to the animal or not.
- hybrid
- horse mother, donkey father, almost always sterile
- smarter
- won't panic-flee into danger like horses do
- sure-footed
- hauls Grand Canyon tourists down sheer cliffs daily
- long-lived
- often works productively past age forty
- hybrid vigor
- stronger and tougher than either parent species
grand canyon mule rides — tourists ride mules 10 miles down to phantom ranch, operating since 1922
mule skinner blues — 1930 song by jimmie rodgers, became signature mule-driving folk standard
cuban mule trade — dominicans exported mules to cuba as primary beast of burden until 1960s