I remembered

Be kind to you web-footed friends
For that duck may be somebody's mother,
it may live in the cold and the swamp,
Where the weather is exceedingly damp,(domp)
Now you may think that's the end of this song,
and it is
but I can prove that I am a liar,
We'll sing the song once again,
Only this time a bit louder and much higher.

Repeat - higher key and louder.....