This was a tough choice. I can think of many books to choose for this one. I settled on a lesser known childhood favorite of mine. One of the few Dr. Suess books I didn't myself own. Enjoy.
"Some fish from the Tropics, all sunburned and hot,
Might decide to swim up!
Well they might...
Might they not?
Racing up north for a chance to get cool,
Full steam ahead for McElligot's Pool!"
"Or I might catch a fish
From a stranger place yet!
From the world's highest river
In far-off Tibet,
Where the falls are so steep
That it's dangerous to ride 'em,
So the fish put up chutes
And they float down beside 'em."