PARULA WARBLER. BLUE YELLOW-BACKED WARBLER. 
Compsothlypis americana. 
Above light-blue, with a patch of yellow in centre of the back; 
chin and throat yellow; breast yellow, spotted with brown; belly dull 
white ; wings brown, with two light bands, some of the feathers edged 
with blue; tail brown, some of the feathers edged with blue, and the 
outer ones spotted near the tips with white; upper mandible dark, 
lower one lighter; legs pale. Length, 4.70 inches. 
Migratory. Arrives middle of May, leaves early in October. Nests in trees. It is not 
easy to examine this bird, since it not only usually keeps to lofty situations in the tree, but 
it is exasperatingly restless and active ; at least so will say the observer who, with opera- 
glass to eye, strives to watch it as it clambers and flutters among the branches and foliage. 
The best periods for observation are during migration; for, in common with many 
Warblers, and some other birds as well, the majority of this species breed farther north. 
The bird student will not have prosecuted his researches for along period without 
remarking a fact concerning the migrations of the Warblersswhich will give a pleasurable 
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