Feral horse (cimarron, mustang, brumby, etc.) — feral descendants of the domestic horse (Equus caballus) with a primitive body type. Height at withers 1300–1550 mm, weight 300000–550000 g (average 350000–450000 g). Strong, dry, compact build with a short back, well-developed musculature and strong limbs. Head relatively large (480–580 mm), profile straight or slightly concave. Ears 110–160 mm. Eyes large, dark brown. Neck muscular, stallions with a pronounced crest. Body deep, chest girth 1600–1900 mm. Limbs dry, with strong cannon bone (girth 175–210 mm). Hooves very strong, dense. Tail hair 600–950 mm. Coat: short and shiny in summer, thick and long (up to 40–60 mm) in winter with undercoat. Predominant colors: bay, black, chestnut, gray, dun, mouse-gray; primitive markings (zebra stripes, dorsal stripe) often present. Differs from selected breeds by drier constitution, strong hooves, pronounced seasonal coat change, large head and high intrapopulation variability. Format index 1.02–1.08.