Great question, Scott!
-- There are many ways to explore that topic, but here is an easy way
to do it, and the method can be used for any species in the world.
eBird is the powerful data base to answer your question.
Go to eBird "Explore" section and then scroll down to "Species maps"
Type in "Dark-eyed Junco" and there will be a list of all
of the flavors or subspecies of those juncos.
Select one, say "Oregon Junco"
Click "all years"
then find the map for where Oregon Juncos are in the winter by selecting just the "January" reports.
The map will show you where Oregons are found in January.
Then use the same search, but change "January' to "June".
You'll see that they go to OREGON! (Well, that's sort of the epicenter for
breeding , but they range widely through the Pacific Northwest, Canada and Alaska).
Then go through the same process for "Gray-headed" or Slate-colored.
"White-winged" is particularly interesting.
If you find those maps intriguing, try it for other species, for example, American Tree Sparrow or Whooping Crane.
Have fun with it, and if you get stuck, let me know.
If you are not on eBird yet, get started and your reward will be learning about all those juncos!
Joe Roller, Denver
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