|Heermann's Song Sparrow (Melospiza melodia heermanni) |
April 20, 2014. Mission Trails Park, San Diego, California. Greg Gillson.
There have been as many as 52 named subspecies, now generally whittled down to 32 (Birds of Oregon: a general reference (2003)) or 24 (Wikipedia), in 5 major groups. However, these show a cline, a gradual and continuous change from one form to another. Songs, though, are pretty much the same across the range.
|Another view of the bird above.|
|Rusty Song Sparrow (Melospiza melodia morphna)|
November 27, 2008. Forest Grove, Oregon. Greg Gillson.