I'm almost with Guest,Mat here.The version I remember from numerous Scout camps was:

We went to the animal fair,
The birds and the beasts were there,
The gay baboon, by the light of the moon, was combing his auburn hair,
The monkey fell out if his bunk, (shouted "THUMP!")
Slid down the elephants trunk, ("WHEEE!")
The elephant sneezed and fell on his knees,
But what became of the monkey monkey monkey monkey.......

at this point half the campfire circle start the verse again whilst the other half continue the two tone repetition of "monkey, monkey..." Although due to the emphasis it sounds more like "Ee-monk, eemonk...." (possibly why it has been transcribed elsewhere as "the monk")

CHEERS

Nigel