Photo courtesy of George Stone • Indigo buntings range from southern Canada to northern Florida during the summer months, occasionally even expanding beyond this wide range.

George Stone emailed me after finding my weekly bird column online.

“I live approximately 90 miles west of Edmonton, Alberta, Canada,” he wrote in his email. “This morning (June 6) I had my first ever sighting of an indigo bunting at my feeder!”

He also asked a question, wanting to know if indigo buntings are rare in his location in Canada.

I did some digging online and found that indigo buntings range from southern Canada to northern Florida in the summer. I relayed this information to George in a reply to his email, congratulating him on his sighting.

I informed him that I reside in Northeast Tennessee, close to the borders with Virginia and North Carolina. I also told him that in summer, indigo bunting is not rare at all here in Northeast Tennessee. I saw and heard several while doing a summer bird count on June 8 in the Limestone Cove community of Unicoi County.

Photo by Bryan Stevens • The male indigo bunting is a resplendent bird.

The male indigo bunting is the only solid blue bird in the eastern United States, but it’s all an illusion — literally a trick of the light. The indigo bunting’s feathers are not really blue; the male’s brilliant azure plumage is caused by the process of diffraction of light around the structure of the bird’s feathers. This process scatters all but the blue light, and the resulting color shifts from black to blue to turquoise as the angle of reflected light changes. In bright light, it can even look unnaturally vivid blue. In poor light, however, an indigo bunting male can appear black. Fortunately, indigo buntings have both a characteristic body shape and song, so even if the birds are not seen in their best light, they can still be recognized.

For such a bright blue bird, indigo buntings are not easy to detect. Males like to find an elevated perch and sing to proclaim their territory and pitch their availability to potential mates. Learn the song, which consists of a burst of jumbled, high-pitched notes, and use that knowledge to help pinpoint singing males. Once you zero in on the singing bird’s location, it’s easy to focus binoculars and enjoy peeking at such a pretty bird.

The indigo bunting belongs to a genus of birds known as Passerina, which is included the family Cardinalidae, which includes birds like Northern cardinal and rose-breasted grosbeak. They are often lumped into a group known as North American buntings, although they are not closely related to such birds as snow bunting and lark bunting. The latter is even recognized as the official state bird for Colorado, a unique honor for this group of birds. The other members of the Passerina genus include lazuli bunting, varied bunting, painted bunting, rose-bellied bunting, orange-breasted bunting and blue grosbeak.

Photo by Bryan Stevens • Newly-returned neotropical migrants, such as this Indigo Bunting, increased the total number of species for the annual spring count.

Worldwide, other birds known as buntings include such descriptively named species as slaty bunting, corn bunting, white-capped bunting, gray-necked bunting, cinereous bunting, lark-like bunting, cinnamon-breasted bunting, chestnut-eared bunting, little bunting, yellow-throated bunting, golden-breasted bunting, black-headed bunting, red-headed bunting and yellow bunting.

For me, the indigo bunting has always been a bird of the summer season. Not even the heat of mid-day tires out a persistently singing male indigo bunting. They linger into the early October, but later in the season the bird begin to molt feathers and take on a more shabby look. Enjoy them while they’re here.

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To ask a question, make a comment or share a sighting, email me at ahoodedwarbler@aol.com.