Are you sure there's no other sparrows? I just pulled a bar chart for a good hotspot in Fairbanks, Creamer's Field State Migratory Waterfowl Refuge. A bunch of sparrows - American Tree, fox, chipping, dark-eyed junco (very populous), definitely white-crowned, golden crowned, savannah, lincoln's. The white-crowns are super distinctive though so you're probably right when you see one. But there definitely are more out there! Plus birds that look sparrow-ish - several kinds of flycatcher, horned lark, pippit, snow bunting, lapland longspur...
For warblers I'm actually slightly jealous, look at how long these guys are there with you instead of 6 weeks total across May/Oct!! Northern waterthrush, orange-crowned, yellow, blackpoll, yellow-rump, Townsend's, Wilson's.
And this kind of ebird output is raw data. I live in MA and there are about 1,000,000,000 birders, including some extremely good ones, so a lot of hotspots are very very very closely monitored. I don't think there's that level of population watching in Alaska (and reporting on ebird. At the height of spring migration there's like 20 checklists [set of observations reported by a group or individual] a day at one of the cemeteries here, it's insane). So all the totals reported there are almost certainly under-reported, and I feel pretty confident there's a lot more birds that aren't even pulling because there's just not that many people reporting. If your landscape is good enough to support big mammals like moose, there are gonna be a lot of birds. NYC can't support moose, but you should look at the Central Park hotspot (273 species!).
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I just pulled a bar chart for a good hotspot in Fairbanks, Creamer's Field State Migratory Waterfowl Refuge. A bunch of sparrows - American Tree, fox, chipping, dark-eyed junco (very populous), definitely white-crowned, golden crowned, savannah, lincoln's. The white-crowns are super distinctive though so you're probably right when you see one. But there definitely are more out there! Plus birds that look sparrow-ish - several kinds of flycatcher, horned lark, pippit, snow bunting, lapland longspur...
For warblers I'm actually slightly jealous, look at how long these guys are there with you instead of 6 weeks total across May/Oct!! Northern waterthrush, orange-crowned, yellow, blackpoll, yellow-rump, Townsend's, Wilson's.
And this kind of ebird output is raw data. I live in MA and there are about 1,000,000,000 birders, including some extremely good ones, so a lot of hotspots are very very very closely monitored. I don't think there's that level of population watching in Alaska (and reporting on ebird. At the height of spring migration there's like 20 checklists [set of observations reported by a group or individual] a day at one of the cemeteries here, it's insane). So all the totals reported there are almost certainly under-reported, and I feel pretty confident there's a lot more birds that aren't even pulling because there's just not that many people reporting. If your landscape is good enough to support big mammals like moose, there are gonna be a lot of birds. NYC can't support moose, but you should look at the Central Park hotspot (273 species!).
I pulled the list for the past 20 years, but if you go back further, there are a LOT more records haha: https://ebird.org/barchart?byr=2000&eyr=2022&bmo=1&emo=12&r=L128537