Benjamin Britten set it to music. It's a poem by Thomas Hardy. Here's the weird thing about Britten - to me, that is. I find the music so-so. Generally too loud and in your face and not light enough. But I find his choice of poetry (and writing and writers in general) exquisite.
So here you go:
Wagtail and Baby (A Satire)
A baby watched a ford, whereto
A wagtail came for drinking;
A blaring bull went wading through,
The wagtail showed no shrinking.
A stallion splashed his way across,
The birdie nearly sinking;
He gave his plumes a twitch and toss,
And held his own unblinking.
Next saw the baby round the spot
A mongrel slowly slinking;
The wagtail gazed, but faltered not
In dip and sip and prinking.
A perfect gentleman then neared;
The wagtail, in a winking,
With terror rose and disappeared;
The baby fell a-thinking.