5. SHARPLY DEFINED BLACK AND WHITE MARKINGS. 
Black crown and throat; gray back; 5 in—CHICKADEE. 
Black and white streaked bird; black crown; 5 in—BLACK POLL WARBLER. 
Black and white streaked bird; striped crown—BLACK AND WHITE WARBLER. 
Slate head, breast and back; white below and outer tail feathers—JUNCO. 
White throat; gray breast; crown striped black and white—WHITE-THROATED 
SPARROW. 
Large white crown patch edged with black; light below—WHITE-CROWNED 
SPARROW. 
Black body; yellowish nape; white rump and on wings—BOBOLINK. 
Black crown; gray back; climbs down trees—WHITE-BREASTED NUTHATCH. 
Dull gray birds with no markings may be FLYCATCHERS. 
Dull brownish, streaked birds are probably species of SPARROWS. 
Plain greenish backs and dull white underparts denote VIREOS. 
Glossy blackbirds are GRACKLES or CROWS; if with red shoulders, RED-WING- 
ED BLACKBIRD; with dull brown head, COWBIRD. 
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