The finch trills in the apple tree 
His: Tiriliree! 
A frog climbs slowly up to him, 
Up to the treetop's leafy rim 
And puffs right up and croaks: "Hallooo, 
Ol' chum: see, I c'n do it too!" 
 
And as the bird his song of spring 
So sweetly to the world doth sing, 
The frog chimes in with sassy tones 
And interjects his bassy drones. 
 
The finch exclaims: "O Joy, hurray! 
I'll fly away!" 
And springs into the azure sky. 
 
 
"Hah!" cries the frog, "Well so kin I!" 
He makes a most ungainly bound 
And splats onto the bare hard ground. 
He's pancake flat, and that's no joke: 
He's croaked his very final croak. 
 
If someone climbs laboriously 
Into the branches of a tree 
And thinks himself a bird to be: 
Wrong is he.
Wilhelm Busch
http://www.poemhunter.com/poem/finch-frog/