Marilyn Shepperson - Black Rat

A black rat arrived at London Docks
Scurried ashore with its companion
Met with a grey rat and had a fight
Died on the quayside, but the companion
Left the black rat for the grey
And entered unseen the great city
But by the end of the week
A lot of people regretted his coming
The plague of the Black Death had arrived

Marilyn Shepperson

http://www.poemhunter.com/poem/black-rat/