1963 Krebs trapping on his Tilden area left to mine says on april 3: "230 mice caught on control 1 acre +/- this week. Est. 3/4 of population caught. :: 250/acre + 50" [need live traps + tag-release] april 30 set 48 Sherman below Ninety Way at 6 p.m. Lots of runways. may 1 night deer. at 7 a.m. traps held 14 Microtine, 15 Rethro, 6 mice. may 3 Krebs reports: "~240 ind. micotus on Tilden. Control 1+ acre this week, est 3/3-3/4 caught." may 6 analysis of scats piled up along pine wood below Ninety way (closest to Inspiration Point) found 21 mice, 3 Rethro, 1 Rabbit, no tge. looked for scat along wood f-- up Big Springs canyon in Tilden to crest, then took along another fire road about 200 yds N of the stream bottom, stopped at several places where grass etc were lush and saw only a few runways. No places where tho habitat was being abused by micotus, nothing like the concentration on my area and on Krebs'area. Only a few scats also, more fresh. (-2) at 4 p.m. set Tilden Grid, every site = (00 traps, saw 1 redtail and 0 cats. Weather warm't nuggy. 3 men on lower half of 35-acre surveying for golf course!! may 7 light rain. Ran traps at 7 a.m., no cats. 37 mice, 8 Rethro, and 1 big Deerbonetries. Left traps set at some places. at 4/2.p.m. traps held 39 mice. Doubled up on traps (2 at every other station: A2, A4, etc), still 98 trbed no cats.