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.[2] Horses between one and two years of age may also be called yearlings.
On June 9, 2007, Rags to Riches became the first filly to win the Belmont Stakes since 1905.[3]
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