a pull at his rein and a toss of his mane...

Oh, a wonderful horse is the Fly-Away Horse -
Perhaps you have seen him before;
Perhaps, while you slept, his shadow has swept

Through the moonlight that floats on the floor.
For it's only at night, when the stars twinkle bright,
That the Fly-Away Horse, with a neigh
And a pull at his rein and a toss of his mane,
Is up on his heels and away!
The Moon in the sky,
As he gallopeth by,
Cries: "Oh! what a marvelous sight!"
And the Stars in dismay
Hide their faces away
In the lap of old Grandmother Night...

--Eugene Field