R.E. Johnson 1967 Journal 91 April 21. Head of Strawberry Canyon, Alameda Co., California . 8AM Completely cloudy & light rain. Zoo 107B Field Trip to run trap line at head of Strawberry Canyon which I set from 2-4 PM on April 20 (not raining then, but rained lightly off & on throughout night). Trap line was a Calhoun line of 20 traps sites set at 50 ft intervals, with 3 traps (Museum specials) at each site. Traps baited with oatmeal. Trap line runs down a steep (45°) slope covered with patches of brush (mainly Coyote Brush), lupine-grass mixture, and open grassland. Rain was not hard enough to remove bait & 5 mice were caught as follows: Stake # Species Size WT Sex Reproduction Habitat 9 Peromyscus 136-67-22-19 11 ♀ no embryos Lupine- truei not lactating grassland 9 Reithrodontomys no embryos. megalotis 151-76-17-15 10.5 ♀ not lactating 11 R. megalotis 145-74-17-15 10.5 ♀ no embryos Sagebrush lactating grassland 18 Microtus 129-31-20-14 23.5 ♂ Lupine- californicus grassland 19 R. megalotis 140-76-17-15 13.5 ♀ embryos: Rt. 5 (11 mm) Lt. 1 lactating Trip ended at 10 AM. Trap line 3 through more extensive grass areas had 5 Microtus & 2 Reithrodontomys + 2 Oregon Juncos. Orange-crowned Warblers could be heard singing lower down the canyon.