Our Common Birds and How to Know Them 
ie Magnolia Warblers, Bay-breasted Warblers, and Blackburnian Warblers may 
be seen on their northern migrations. Bobolinks. Orchard Orioles, Red- 
eyed Vireos, Wood Pewees, Scarlet Tanagers, Maryland Yellow-throats, 
Black-throated Green Warblers, Worm-eating Warblers, Hooded Warblers, 
Cuckoos, Indigo-birds, Great Crested Flycatchers, Least Flycatchers and 
Hummingbirds come. 
White-throated Sparrows leave for the north. Hermit Thrushes become less 
common, most of these also retiring northward. Myrtlebirds also resume 
their northward journey 
20 to 31. — Black-poll Warblers and Yellow-bellied Flycatchers pass, going north. Marsh 
Wrens appear, and one may hope for an occasional sight of a Cardinal 
Grosbeak. 
During June, July and August the birds effect little change of locality, as nests have 
been constructed and the duties of incubation assumed. In many cases young birds have 
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