BIRD-STUDY 103 



Y Cheeks yellow Black-throated Green Warbler 



YY Cheeks not yellow, orange-yellow 



on wings and tail American Redstart 



A- 10. Birds that appear chiefly brown 

 E Brown all over 



I Seal brown all over, no markings Cowbird, female 



II Rusty brown all over, yellow eye Rusty Blackbird, female 



EE Not all-over brown 



I Upper parts brown and unstreaked, unspotted 



Crested Cedar Waxwing 



OO Uncrested; under parts spotted or streaked 



X With wing bars; larger than robin Brown Thrasher 



XX Without wing bars 



Y Larger than a robin 



a Bill yellow Yellow-billed Cuckoo 



aa Bill black Black-billed Cuckoo 



YY Smaller than a robin 



a Tail rufous, brighter than back Hermit Thrush 

 aa Tail not brighter than back 

 o Crown orange bordered by 



black Ovenbird 



oo Crown not orange 



x Back of head much 

 lighter than back; spots 

 on breast round, large Wood Thrush 



xx Back of head not lighter 

 than back 



y White line over eye 

 extending back of eye 

 z Throat streaked Water Thrush 



zz T hroat not 



streaked Louisiana Water Thrush 

 yy Line, if any, over eye 

 not extending back of 

 eye 



z Upper parts cin- 

 namon brown, no 



eye ring Veery or Wilson's Thrush 

 zz Upper parts olive 

 J Eye ring white; 



lores gray Gray-cheeked Thrush 

 It Eye ring cream 

 buff, as also 

 lores Olive-backed Thrush 



