A filly: a female horse that is too young to be called a mare, typically under four years old.
A mustang: A small, hardy horse from the American plains.
Growing up in Iola, youre destined to learn two cheers. Lets go, Mustangs! and Lets go, Fillies! Most readers can already hear the clap, clap, clap-clap-clap that follow. As children, we have repeated these chants year after year until it finally hits: why does Iola High School have two mascots?