Black-Throated Blue Warbler  Dendroica caerulescens
Black-Throated Blue Warbler  Dendroica caerulescens

This warbler can be found within the interior of deciduous hardwood or mixed undisturbed forests of maple, beech, eastern hemlock, spruce and fir with a dense undergrowth of shrubs, especially rhododendron bogs.
Although it feeds mainly on insects, it also takes some seeds, berries and small fruits, such as wild grapes, and flower nectar.
The nesting site is in thick shrubs such as laurel, alder, rhododendron, viburnum and saplings within six ft. from the ground.  80% of Black-Throated Blue Warblers return to nesting territory with previous years mate.  The sexes of the Black-Throated Blue Warbler look so different that they were previously thought to be two separate species. 
As a result of living deep in the interior of forests, it rarely is subject to cowbird infestation, although it is vulnerable to loss of habitat, as it requires tracts of unbroken forests.
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Copyright Mark Tiefenbach                              Deep Brook Nature Photography
Copyright Mark Tiefenbach                              Deep Brook Nature Photography
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