What is a young female horse called?

A young female horse is specifically referred to as a filly. This term is used to describe female horses that are typically under the age of three years. It differentiates them from adult female horses, known as mares, which are usually three years or older. Understanding this terminology is crucial for anyone involved in equine studies or horse care, as it allows for precise communication about the age and gender of horses.

In this context, the term yearling refers to a horse that is one year old, regardless of its gender, which is different from the specific classification of a filly. A mare denotes an adult female horse, while a stallion refers to a male horse, further emphasizing that the correct answer pertains specifically to young females in that category. By grasping the distinction between these terms, one can better understand horse breeding, training, and care.