io8 A FIELD GUIDE IN NATURE-STUDY 



III Slender, dovelike bird, gray in color, call a soft 



coo Mourning Dove 



EE Birds no larger than a sparrow 

 I Upper parts olive green 



O White and black line over eye Red-eyed Vireo 



OO No line over eye 



X No wing bars Warbling Vireo 



XX With wing bars Ruby-crowned Kinglet 



II Upper parts not olive green, but slaty; breast 

 slaty, belly white, bill horn color; outer tail 

 feathers white Junco 



