- Horses evolved over the past 50 million years and began being domesticated by humans around 3500 BC.
- The Przewalski's horse was never domesticated, making it the only true "wild horse" still with us today.
- World horse population is estimated at 58 million, according to a 2006 FAOSTAT report.
- Their average lifespan is between 25 and 30 years.
- "Old Billy" lived to be 62 years old, the oldest verifiable horse. He lived back in the 19th-century.
- Horses can weigh from 840 lb (380 kg) to 2,200 lb (1,000 kg); while their height can usually go from 56 inches (142 cm) to 72 inches (183 cm).
- The largest horse ever recorded was 86.25 inches (219 cm) tall and up to 3,360 lb (1,524 kg) in weight.
- Female horses are called "mares" and carry their young, called a foal, for about 11 months.
- Horse breeds are usually categorized based on their temperament: spirited "hot bloods" (speed & endurance); "cold bloods" (good for slow and heavy work); and "warmbloods", developed from crosses between hot and cold bloods.
- Ponies are --taxonomically-- the same animals as horses. They developed small stature because they lived on marginally livable horse habitat.
- The horse genome was sequenced in 2007 with 2.7 billion DNA base pairs.
- The horse skeleton has an average of 205 bones.
- Horses are herbivores and have a small stomach compared to humans. An average horse would eat around 24 lb (11 kg) of food and drink 10 US gal (37.8 l) of water.
- They have largest eyes of any land mammal and have a range of vision of over 350°.
- Horses are not color blind; they have dichromatic (two-color) vision.
- Horses have a great sense of taste and contact, sensing something as subtle as an insect on any part of their body.
- They can move at a speed of 4.0 mph (6.4 km/h) to 30 mph (48 km/h), with the world record being 43.97 mph (70.76 km/h).
- Domestic horses sleep around 2.9 hours per day, usually in short intervals of about 15 minutes.
The smallest horse in the world is just 17 inches (43 cm) tall and weighs 57 lb (26 kg).
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