filly horse age

Horses
Why is a horse called a mare?
29
Horses
What does mare mean in Japanese?
44
Horses
Why is a horse called a filly?
51
Horses
What is a spayed female horse called?
44
Horses
What is a Philly in horses?
61
Horses
Why is a horse called a Philly?
130
Horses
Whats the difference between fillies and mares?
349