From DwarfFortressWiki
Mules are sterile hybrids of a horse father and a donkey mother in reality. In Dwarf Fortress they are indeed sterile, but cannot actually be bred from horses and donkeys, making them little more than a snack on the hoof. They are available for selection on the embark screen for most dwarven parties and cost 101 points.
| Game Object Data
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| [CREATURE:MULE]
[NAME:mule:mules:mule]
[TILE:'M'][COLOR:6:0:0]
[PETVALUE:200]
[PREFSTRING:stubborness]
[LARGE_ROAMING]
[COMMON_DOMESTIC][PACK_ANIMAL]
[BENIGN][MEANDERER][PET]
[BODY:QUADRUPED:TAIL:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:MOUTH]
[BODYGLOSS:HOOF][NATURAL]
[SIZE:8]
[ATTACK:MAIN:BYTYPE:STANCE:kick:kicks:1:2:BLUDGEON][ATTACKFLAG_WITH]
[FAT:4]
[DIURNAL]
[STANDARD_FLESH]
[HOMEOTHERM:10068]
[LAYERING:100]
[SWIMS_INNATE][SWIM_SPEED:2500]
[TRADE_CAPACITY:2000]
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