BIBBLE, D.O. 1984 PEROMYSUS CALIFORNICUS 20 Hastings Reservation, Monterey Co., Calif. April 30. This AM on GRID WB I reduced ♀1515, 38.5g, lact, st 15.12 with RED; ♀1175, 42g, post-lact, st 7.5 with GREEN; I returned ♂1488 to lab to put in cage with 1429 (see below); caught ♂1518, st 10.8 with PURPLE Perhaps visible in ears (need confirmation under dark); reduced ♀1500, 40.5g, st 9.7 with PURPLE. #1549 ♀ Mature, pregnant, post-lact, 54g. Ear-tagged. GRID WB, st 2, l. Collected tissues in field and dusted RED upon release. This AM on [illegible] RC drift fence, st E-B I reduced ♀0340, st 5.8w/ GREEN. Lately this am I toe-clipped and collected <1cm tail tip from the♀♀ offspring I caught in traps on 28 April. Also put ♂1488 with ♀♀1429. Sought I plan on repatriating these mice. Tails were clipped as follows: ♀♀1183 pups #01000♂ #04000♂ #0180♀ tails marked ♂1183 #1000 etc/ down arrow 1 pup with pinna erect, other 2 still closed ♀♀1429 #01000♀ - pinna erect, more fully haired than above. This afternoon while resetting traps I put the above mice families in their cages out in the field (see Journal for locations). Covered each with tar paper, and rocks. This PM while checking traps I cracked open each cage; inserted a piece of hardware cloth in the crack so they could climb-out. In both cases the ♂s immediately jumped out, but the female remained inside. This PM on GRID WB2 I caught ♀1539 with very faint GREEN or Blue-GREEN visible in its ears - Maybe offspring of 1175 or 1429? Probably not 1429, but need to check D.A.!! Calculated 60 day old, from 25 Feb - possible, 1175.