[Length 5.5 in. Wingspan 9 in.]

This female Blackpoll Warbler was photographed near St. John's, Newfoundland, Canada. Photo taken with a Nikkor 300mm EDAF f4.0 lens on Kodachrome 200 film. (Date: August 1994)

[Length 5.25 in. Wingspan 7.75 in.]

This male Black-throated Blue Warbler was photographed at the visitor center, Laguna Atascosa NWR, Texas, USA. Photo taken with a AF-S VR Nikkor 300mm f/2.8G IF-ED lens + Nikkor TC20E II 2.0x Teleconverter (EFL=900mm) on a Nikon D300 camera. (Date: May 7, 2009)

[Length 5.25 in. Wingspan 7.75 in.]

This female Black-throated Blue Warbler was photographed at the Magee Marsh boardwalk, Oak Harbor, Ohio, USA. Photo taken with a AF-S VR Nikkor 300mm f/2.8G IF-ED lens + Nikkor TC14E II 1.4x Teleconverter (EFL=630mm) on a Nikon D7000 camera. (Date: May 15, 2012)

[Length 5.25 in. Wingspan 7.75 in.]

Black-throated Blue Warblers breed in the northeastern US and along southern Canada and the northern US as far west as Manitoba and Minnesota. The male is unmistakable with his rich blue back and black throat and sides. Females have none of the male's color or pattern, but both share a white spot along the lower edge of the folded wing. This "pocket handkerchief" is also a diagnostic field mark for both males and females in all plumages. This beautiful male was photographed during fall migration at Cape May, New Jersey, USA. Photo taken with a 300mm f4.5 Nikkor ED lens on Kodachrome 64 film. (Date: September 1983)

[Length 5 in. Wingspan 7.75 in.]

This Black-throated Gray Warbler was photographed at a mountain road, Lompoc, California, USA. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: June 29, 2013)

[Length 5 in. Wingspan 7.75 in.]

This Black-throated Gray Warbler was photographed at Sequoia National Forest, California, USA. Photo taken with a AF-S VR Zoom-Nikkor 80-400mm f/4.5-5.6G IF-ED lens on a Nikon D7100 camera. (Date: July 5, 2013)

[Length 5 in. Wingspan 7.75 in.]

Black-throated Gray Warblers breed in the foothills and mountains of western and northwestern US and southwestern British Columbia. But, this one was photographed in a small courtyard where it spent the winter on the Princeton University campus in central New Jersey, USA. Photo taken with a 300mm f4.5 Nikkor ED lens on Ektachrome 200 film pushed to 400. (Date: December 1982)

[Length 5 in. Wingspan 7.75 in.]

Black-throated Green Warblers are common breeding birds of coniferous and mixed woodlands in the northeastern US, and eastern and southcentral Canada. No other eastern warbler has the combination of a yellow face, dark black throat, and black wings with white wing bars. Their loud "ZEEE ZEEE ZEE-ZU-ZEE" song, which is heard in migration and on their breeding grounds, is also one of the easiest to learn. This male Black-throated Green Warbler was photographed at Sabine Woods - TOS, Texas, USA. Photo taken with a Nikkor 300mm EDAF-S f4 lens + Nikkor TC20E II 2.0x Teleconverter (EFL=900mm) on a Nikon D100 camera. (Date: April 21, 2006)