241 am ACTIVITY STRATA USING FIDLER | 0-1,000 CPM 1,000-5,000 CPM 5,000-10,000 CPM 10,000-25,000 CPM 25,000-50,000 CPM >50,000 CPM CENTERSof ACTIVITY INNER FENCE OUTER ~a\ FENCE eeneecaeueee \Sa& FIGURE 4. Area 13--Centers of Activity for Sacrificed Small Vertebrates. 243