BlueBirder: Bird Taxonomy and some Bird Subspecies ID

Birds are in the class Aves, Phylum Chordate, Kingdom Animal. Each species has a Genus like the Blue Jay (Cyanocitta cristata), Steller's Jay the western counterpart of the Blue Jay is also in the Genus Cyanocitta. In this Blog Post I will include some facts about Bird Taxonomy and Subspecies Identification help:

Some birds have had taxon swaps last year, like Downy and Hairy woodpeckers. Which were in the genus Picoides and now in the genus Dryobates. And the Wigeons and Allies are now in the genus Mareca. Pretty interesting! This obviously has to do with taxonomy, for people who don't know. I hope to be a taxonomist. Taxon swaps happen when; the science and process of naming living organisms, is a field that is constantly changing. When our scientific understanding of animal species and their relationships changes, it may mean that scientific names change as well. ... Some species have come to be known by multiple scientific names. Most books like the Sibley Field Guide to Birds are not updated with taxon changes. Subspecies are the different "Types" of the birds that occur in different ranges, though Fox Sparrow has many different subspecies I personally have seen P.i. iliaca which is the wintering subspecies of Fox Sparrow that occurs in Connecticut. Dark-eyed Juncos often intergrade with other Dark-eyed Junco subspecies. Connecticut has had the Oregon Junco, though not sure if it was J.h. montanus etc. Connecticut also had a Cassiar Junco J.h. cismontanus. I wrote the top stuff in Here is some subspecies ID stuff for Mew Gull: Mew Gulls are common and widespread in Eurasia and Western North America. My friend Jory told me "Subspecies are spread out, and we do not regularly have more than one subspecies of most bird species, the best way to learn about subspecies other than the ones in CT is to read papers, books, and other such resources. All good field guides should show all expected, and some unexpected subspecies found across the US."

Now, about the Fox Sparrow:
Red Fox Sparrow (P.i. iliaca): This taxon breeds in the taiga of Canada and Alaska and winters in central and eastern North America. This is the brightest colored group.
Sooty Fox Sparrow (P.i. unalaschcensis): This taxon breeds along the Pacific Coast of North America from the Aleutian Islands to northwestern Washington, and winters from southeastern Alaska south to northern Baja California. It is browner and darker than the red fox sparrow.
Slate-colored Fox Sparrow (P.i. schistacea): his taxon breeds in interior western North America and winters to the south and west. It has a gray head and mantle, brown wings, brown breast streaks, and a russet tail.
Thick-billed Fox Sparrow (P.i. megarhyncha) this taxon is mostly restricted to California and Oregon. This group is similar in coloration to the slate-colored fox sparrow, but features a particularly thick bill, as its name would suggest.