Taxonomy
More specific information regarding plumage is available in the accounts for the various taxa.
- P. i. iliaca Red Fox Sparrow is the generally central and east coast taxa in the genus Passerella. This is the brightest colored group.
- P. i. unalaschcensis Sooty Fox Sparrow is the west coast taxa in the genus Passerella. It is browner and darker than the Red Fox Sparrow.
- P. i. schistacea Slate-colored Fox Sparrow is the Rocky Mountain taxa in the genus Passerella. It is a tiny-billed bird with a gray head and mantle, brown wings, brown breast streaks, and a russet tail.
- P. i. megarhyncha Thick-billed Fox Sparrow is the Sierra Nevada taxa in the genus Passerella. This group features a particularly thick bill, as its name would suggest.
Read more about this topic: Fox Sparrow