ZIEGLER 1956 MICROTUS CALIFORNICUS MAY 6 POINT ISABEEN, CONTRA COSTA CO. CALIF. AT 8:40 AM HEARD A NEW SPRING IN SANICARN AS I WAS RUNNING TRAPS. FOUND A MICROTUS JUST CAUGHT. ON SMALL 3 X 12 FT HILL IN SANICARN MARESH ABOUT 1 FOOT HIGHER THAN MARSH, FLOOR OF MARSH WAS MOSTLY RATHER MOODY BUT WITH SEVERAL DRYE HIHNOCKS SURROUNDING THIS ONE WHICH COULD BE USED BY THE MOUSE TO REACH THE HIGHER & DRY ROAD MORAIN, 20 FT AWAY. ON THIS HIHNOCK I FOUND 3 OR 4 PILES OF 1 TO 1½ INCH LONG SANICARN/IA TRAPS & SEGMENTS RINGED UP 2 OR 3 JOBS O' MAYBE 2½ INCHES IN DIAMETER PILES IN MORE OR LESS WORN DEFINED RUNS AND BOTTOM LAYERS OF PILES SHOWED APPARENTLY PITH OF SAWC. MAYBE MOUSE USES THESE PILES FOR FEEDING SPOTS. SPOTS MOSTLY WERE COVERED BUT 1 OR 2 OUT WITH OVERHEAD OPEN. FOUND PILES OF SAWC. LIKE THESE IN MANY OF THE RUN SYSTEMS AROUND MARSH, ON HIGHER GROUND PILES OF FESTUCA SEEM TO BE THE EQUIVALENTS AND 2OR 3 TIMES THOSE PILES INSTEAD OF BEING CUT IN OAKN OR IN HALF-COVERED RUNS WHERE UNDER BOARDS OR LOGS. IN SANICARNIA I USUALLY SET TRAPS ON THE PILES OF CUTTINGS,