There's also the song:

The Animal Fair?

I went to the animal fair
The birds and the bees were there
The big baboon
By the light of the moon
Was combing his auburn hair
The monkey sat kerplunk
Right on the elephant's trunk
The elephant sneezed
And fell on his knees
But what became of the monk,
The monk, the monk, the monk?
But what became of the monk.

Mark, when they were small, my kids used to sing Heather Bishop's Hippopotamus Song and Bellybutton, mimicing her voice. The lady has decidedly unique vocal qualities and their rendition was a hoot.