A filly is a young female horse too young to be called a mare. Female (♀ is the Sex of an Organism, or a part of an organism which produces ova (egg cells The horse ( Equus caballus) is a hoofed ( Ungulate) Mammal, one of eight living species of the family Equidae. There are several specific definitions in use.
The equivalent term for a male is a colt. A colt is a young Male Horse, under the age of four However in olden days the word 'colt' referred to any young or infant horse regardless of gender When horses of either sex are less than one year of age, they are referred to as foals. A foal is a Horse that is one year old or younger More specific terms are colt for a Male foal and Filly for a Female foal [1] Horses between one and two years of age may also be called yearlings. A yearling is a young Horse of either sex that is between one and two years old
On June 9, 2007, Rags to Riches became the first filly to win the Belmont Stakes since 1905. Rags to Riches (foaled February 27 2004 in Kentucky) is an American Thoroughbred Filly racehorse. The Belmont Stakes is a prestigious American Grade I stakes race held yearly in June at Belmont Park in Elmont New York. [2]