The rosy-finches live in the highest altitude of all finches found in North America. There are three types of rosy-finches found on the North American continent. These finches are seen in large flocks and are often seen visiting local birdfeeders in the winter months.
The rosy-finches all have similar appearances but are identified by different plumage. The Gray-crowned Rosy-Finch has three sub-species or races, the interior race, the exterior race or Hepburn's and a race found in the western regions of Alaska and out onto the ocean islands. The Black Rosy-Finch is found in the mountains of the western states. The Brown-capped Rosy-Finch is found in a small area of three central states.
Avibase - the world bird database This site provides the user with a complete list of bird species, broken down per country, or in the example of the US or Canada, per state and province. Here, bird species names are available in other languages, a great asset to be used as a translation of foreign bird names.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.
I hope you will take advantage of these suggested websites. I have used each of them, in one way or another, throughout the years in my quest to better identify and understand our fine feathered friends.