Horses are a group of animals of the family Equidae.
The standard horse is the species Equus caballus. It was domesticated from wild horses by humans at least 5000 years ago. They are large, strong animals and some breeds are used to pull heavy loads.
A male horse is a stallion, and a female horse is a mare, while the general term for a young horse is a foal. A young female horse is a filly, and a young male horse is a colt. A castrated horse is a gelding. A small adult horse is called a pony. A pack of horses, called a herd, can be led by a top stallion and a top mare.
Horses are related to the rhino and tapir in the order Perissodactyla. Equus is the old Latin word for horse.