A tiny, two-feet tall horse-like animal scampers through a forest, nibbling on leaves. This isn't a fairy tale, but a look back in time at Hyracotherium,
an ancient member of the horse family. For millions of years, many horse species in all shapes
and sizes roamed Earth's forests and grasslands. But only a very few that were adapted to the grasslands survived. All domestic horses belong
to a single species, Equus caballus.

Scientific name: Equus caballus
Number of breeds: over 200
Examples of breeds: Arabian, quarterhorse, thoroughbred, Shetland pony, Clydesdale
First domesticated: About 6,000 years ago
Diet: grasses
Gender names: mare (female); stallion (male)
Cool fact: Horseback riding first became common in Afghanistan and Iran, around 4,000 to 3,500 years ago.

Image credits: main image, courtesy of AMNH; Sandra Olsen: courtesy of Sandra Olsen; Sandra Olsen: courtesy of Sandra Olsen.