public void describeBehaviour(Description d) {
    if (type == TYPE_WANDERING) {
      d.append("Wandering") ;
    }
    if (type == TYPE_SECURITY) {
      d.append("Securing perimeter for ") ;
      d.append(guarded) ;
    }
    if (type == TYPE_STREET_PATROL || type == TYPE_SENTRY_DUTY) {
      d.append("Patrolling between ") ;
      d.append(guarded) ; d.append(" and ") ;
      d.append(patrolled.last()) ;
    }
  }