Single mouse...

This bill for the Manchester Evening News is, quite possibly, my favourite sighting during two days in Manchester (although the large gathering of female Celtic fans battering the permed hair out of each other comes a close second. But I didn't get a pic of that, d'oh!). Single mouse causes havoc at baby unit? Huh? Had the mouse just separated from its rodent partner and gone on a vandalism spree? Are these single mice more prone to causing havoc at baby units than their married counterparts?