PLATE 13 



a. Margin of San Joaquin Valley near Snelling, showing associations in Lower 

 Sonoran Life Zone. View taken in printer from earth bluflfs northeast of town looking 

 south across cultivated and pastured river-bottom lands; a slough scatteringly bordered 

 with willows in middle distance, and Fremont cottonwoods bordering Merced Eiver in 

 far distance. 



b. The blue oak marks a conspicuous association several miles in width along the 

 foothills bordering the San Joaquin Valley. The view here shown was taken in February 

 in the Upper Sonoran Zone near Pleasant Valley. In \A'inter the mistletoe clumps in 

 these trees are patronized for berries by the Audubon Warbler, Western Robin and 

 Western Bluebird; throughout the year these trees are inhabited by such birds as the 

 California Woodpecker, Interior California Jay, Phainopepla, Plain Titmouse, and 

 Slender-billed Nuthatch. 



[670] 



