There is a final verse.
The bold hippopotamus, whose love song we know
Is now married and father of ten.
He murmurs 'God rot 'em ' as he watches them grow,
And he longs to be single again.
He'll gambol no more on the banks of the Nile,
Which Nasser is flooding next spring.
With hippopotamas
In silken pajamas
No more will he teach them to sing...
ch. Mud! Mud! Glorious mud! etc.
The reference to Nasser is most likely pertaining to the Aswan High Dam.

troll