The male black-throated
blue warbler is unmistakable with its strong black face, throat, and
flank, and its blue dorsal plumage. For photographers, this is
yet another warbler which is difficult to properly expose, due to the
combination of black and white plumage elements. Strong flash can
help to bring out details in the black face, though unfortunately the
blue dorsal plumage reacts unfavorably to flash (due to the bird's use
of structural interference
colors rather than true pigment). Females look radically
different, but are easily identified by the small, white wing
patch. The images below show that there is very little plumage
variation in the males. This species is common in the second and
third weeks of May, with peak numbers typically in the second week.
Click to zoom
Below is the Wikipedia
page for this species, which provides more detailed information about
this bird:
