A colt is a young male horse, under the age of four. Male (♂ refers to the sex of an organism or part of an organism which produces small mobile Gametes called spermatozoa. The horse ( Equus caballus) is a hoofed ( Ungulate) Mammal, one of eight living species of the family Equidae. An older male horse is called either a "stallion" if left fertile, or a "gelding" if neutered. A gelding is a castrated animal &mdash in English the term specifically refers to a castrated male Horse or other Equine such as a Donkey A young male horse is considered a colt even if he is gelded. The verb 'to geld' refers to the process of neutering a stallion. Neutering, from the Latin neuter (of neither sex is the removal of an animal's Reproductive organ, either all of it or a considerably large part
A young female horse is called a filly until age five, and a mare thereafter. A filly is a young Female Horse too young to be called a mare. As late as the 1930s, "colt" meant "a horse under the age of four," and so could also be used to refer to a filly.
A group of colts is called a "rag".
In the wild, colts are kicked out of their herds when they become stallions by the stallion of the herd. When they are kicked out, they usually will be able to find a herd made of other young stallions or yearlings. They stay with this band until they are mature enough to form their own herd of mares and take care of them, however some stay in their "bachelor" herd and try to steal from other stallions.
References
1. Webster's Collegiate Dictionary, fifth edition. G. & C. Merriam Co. , Springfield: Mass. , 1947.
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