The Savannah Sparrow is a very variable species, with numerous subspecies, several of which have been split as separate species at various times.

- Image ID: MMFC5H
The Savannah Sparrow is a very variable species, with numerous subspecies, several of which have been split as separate species at various times.
Michael Shake / Alamy Stock Photo
Image ID: MMFC5H
The Savannah sparrow is a very variable species, with numerous subspecies, several of which have been split as separate species at various times. The different forms vary principally in the darkness of the plumage.
Location: Magee Marsh Wildlife Area, Ohio, USA