it is called a stall
It is called a corral.
A stable.
Horses are just called "horses" unless they are in a group together. When horses get in a group together, they are then called a "herd".
they are called mustangs. they are the American wild horses. Australian wild horses are called brumbys.
A dozen horses is usually called a 'string' of horses.
They are called a herd of horses.
Horses, generally.
There are wild horses on the islands of the Outerbanks. They are called Corolla Wild Horses and/or Banker Horses...here's some info...http://en.wikipedia.org/wiki/Banker_HorseThe best place to find information about the history of the horses, how they arrived, and how you can help to protect and preserve them - go to www.corollawildhorses.org
American wild horses are generally called mustangs.
Some horses do live in grasslands, but that is not the only place you will find them. Horses live in all kinds of territory, from the marshes of camarogue to desert-like areas with hard rocky ground and sparse grass.
A herd of horses
a herd of horses