YELLOW WARBLER 
hazel-bush close by the old blackberry vines, 
until a vigorous shaking of the branches 
disturbed them. 
It is really almost as profitable to prowl 
through the clearings by moonlight as in the 
daytime, if one is sufficiently familiar with 
birds to recognize species by their size, form, 
and flight ; for up from the ferns, out of the 
bushes, and sometimes from the top of fence- 
posts, one may flush these little sleepers and 
discover where they spend their nights. 
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