A filly is a young female horse too young to be called a mare. There are several specific definitions in use.
The equivalent term for a male is a colt. When horses of either sex are less than one year of age, they are referred to as foals. Horses between one and two years of age may also be called yearlings.
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Filly
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Gelding
A gelding is a castrated animal — in English, the term specifically refers to a castrated male horse or other equine such as a donkey or a mule. As a verb, it also refers to the castration procedure itself. The word comes from the Old Norse geldr ("barren"). Castration, and the elimination of... -
Colt
A colt is a young male horse, under the age of four. The term "colt" is often confused with foal, which refers to a horse of either sex under one year of age. An adult male horse if left intact is called either a "stallion" or a horse (sometimes full horse); if castrated, it is called a gelding. A... -
Stallion
A stallion is a male horse that has not been neutered, castrated, or gelded. Stallions will follow the conformation and phenotype of their breed, but within that standard, the presence of hormones such as testosterone may give stallions a thicker, "cresty" neck as well as a somewhat more muscular... -
Mare
A mare is an adult female horse or other equine. Most of the time, a mare is a female horse over the age of three, and a filly is a female horse age three and younger. However, in Thoroughbred horse racing, a mare is defined as a female horse more than four years old; in harness racing a mare is a...