Peter grin "Sheenanigans"

how topical

I was having a go, (they were good words/so many word rhymed with both) I was nearly there, just having trouble with the last line.....

this is where I got.

The keepers at the zoo had to rehabilate
A young chimp who needed a playmate
Because of damage they had to reinsure
When with an elephant he drank liqueur
...............................prostrate.