On horse vs. steed

Today's gain from curiosity

匹”通常用来修饰体形较大且外观矫健的动物，如马、骡、狼等

只”通常用来修饰体形较小的动物，如猫、兔、鸡等。

“头”一般修饰体形较大且外观显得笨拙的动物，如牛、驴、狮子等，猪也可以用“头”

Pi, "often used to decorate larger body and vigorous appearance of animals such as horses, mules, wolves

Zhi "is usually used to decorate smaller size animals such as cats, rabbits, chickens.

Tou modified shape and the appearance of a clumsy animal, such as cattle, donkeys, lions, pigs can also use the "head"