|Adult Gambel's White-crowned Sparrow. San Marcos, California. December 14, 2014. Greg Gillson.|
So here in San Diego, I have only seen the Gambel's form, October to April. Any other form would be rare here.
The 5 different recognized forms of White-crowned Sparrows across North America differ slightly in whether the black stripe continues through and in front of the eye, the dinginess of the underparts, the brightness of the back streaking, the color of the bill, and in song structure.
Five years ago I wrote about telling Puget Sound and Gambel's White-crowned Sparrows apart from an Oregon perspective.
|Immature Gambel's White-crowned Sparrow. San Marcos, California. December 14, 2014. Greg Gillson.|