Probably the most haunting poem about rats has to be the one Robert Southey wrote about the evil Bishop Hatto and God's judgment for his greed during a massive crop failure in medieval Germany:

At last Bishop Hatto appointed a day
To quiet the poor without delay;
He bade them to his great Barn repair,
And they should have food for the winter there.

Rejoiced such tidings good to hear,
The poor folk flock'd from far and near;
The great barn was full as it could hold
Of women and children, and young and old.

Then when he saw it could hold no more,
Bishop Hatto he made fast the door;
And while for mercy on Christ they call,
He set fire to the Barn and burnt them all...

Ten thousand rats were sent by God to excercise punishment:

They are not to be told by the dozen or score,
By thousands they come, and by myriads and more,
Such numbers had never been heard of before,
Such a judgment had never been witness'd of yore.

Down on his knees the Bishop fell,
And faster and faster his beads did he tell,
As louder and louder drawing near
The gnawing of their teeth he could hear.

And in at the windows and in at the door,
And through the walls helter-skelter they pour,
And down from the ceiling and up through the floor,
From the right and the left, from behind and before,
From within and without, from above and below,
And all at once to the Bishop they go.

They have whetted their teeth against the stones,
And now they pick the Bishop's bones:
They gnaw'd the flesh from every limb,
For they were sent to do judgment on him!

Have a nice day!

Charley Noble