Is this inside or outside? If the hutch is the kind with 4 legs, you could make a moat around each leg [that would take lifting each leg] filled with water or something that ants can't get through. That would stop new ants getting in & the traps should kill off the ones already there. That would probably damage the legs, though, so maybe some revisions would be necessary.
Tipnut.com has suggestions for killing ants in safe ways.