Horses are unable to burp, vomit or breathe through their mouths. Their digestive system only works in one direction. The drawback is that this can cause colic. ¹⁾.

The peak power output of the horse could be as high as ~15hp; 1 hp (horsepower) is a rate of sustained activity of horse in typical works in agriculture or powering industrial machines ²⁾.

Adult stallions have up to 44 permanent teeth in their mouth at once Mares usually have between 36 and 40 teeth.³⁾.

Old Billy, born in England, in 1760 was the longest-living horse, verified to be 62 at the day of his death. He lived as a barge horse that pulled barges up and down canals ⁴⁾.