Voles

O'BRIEN: 

No. All right, come to papa.
 

SISKO: 

Major?
 

KIRA: 

Voles, sir.
 

SISKO: 

Voles?
 

KIRA: 

A Cardassian legacy.

O'BRIEN: 

They weren't bothering us until we started moving into areas of the station that they've been hiding in. 

Now they're spreading out all over the place.
 

(He pulls out a piece of gnawed cable)
 

 O'BRIEN: 

They seem to be attracted to electromagnetic fields. Give me a hand, Major, will you?
 

SISKO: 

Phasers on stun, Mister O'Brien. 

I want those voles taken alive.