Quack, quack, quack

I knew a duck called Shakespeare
a bird of poetic bent
instead of to be or not to be
quack quack quack he went.

I knew a duck called Schiller
a most lyrical water fowl
he thought on grosse Seelen
and quack quack quack he howled.

there was the duck called Bertrand
his mind on wisdom wracked
and with a philosophical wit
he stated quack quack quack.