Our Common Birds and How to Know Them 
entered into existence and by their immature and changing plumage have added to the 
difficulties which the unaccustomed observer has already had in identifying specimens. 
Indeed, unless the student has by this time made considerable progress in his acquaintance 
with birds, he will now experience that embarrassment which arises from a superabund- 
ance of material, and will find the number of birds present bewildering to classify, both 
because of the great variety and because of the dissimilarity of the male, female and young 
of each species. 
Let him, however, not despair ; much may still be done by observation, and even 
from the order of their retirement specimens may be identified. 
Sept. 
1 to 15  Wilson’s Thrushes, Yellow-breasted Chats, Yellow Warblers, Hooded Warblers, 
Barn Swallows, Bank Swallows, Baltimore Orioles, Kingbirds, Whip-poor- 
wills, and Hummingbirds now go south. 
Blackburnian Warblers, Magnolia Warblers and Yellow-bellied Flycatchers 
pass on their southern migration. 
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