21 confusing fall warblers

(or make that 21 confusing North American wood-warblers in autumn if you prefer)

Perhaps a tad late since most of the warblers have already passed through Manitoba by now, but, just for fun, thought I'd post a little bit of an ID challenge – 21 photos of warbler all taken in Manitoba in fall (autumn).

Some of these birds look a lot different to the way they look in spring, others are more similar, so see if you can identify them before you scroll down for the answers (without cheating)… I kept the order random and, oh yeah, little hint, there are some repeats…

I’ll post more photos of some of their behaviour that I was able to observe this fall as soon as I can. Also, if you have question about these I can offer ID notes in a few days or so....

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ANSWERS:
1) American Redstart (first-year male)
2) Common Yellowthroat (first-year female)
3) Palm Warbler (adult in basic plumage)
4) Magnolia Warbler (adult in basic plumage)
5) Mourning Warbler (adult male)
6) Cape May Warbler (male I believe, in basic plumage)
7) Canada Warbler (first-year female)
8) Tennessee Warbler (in the middle of prebasic moult)
9) Yellow-rumped Warbler (adult in basic plumage)
10) Nashville Warbler
11) Chestnut-sided Warbler
12) Blackburnian Warbler (male in basic plumage)
13) Magnolia Warbler (this bird with a little less streaking than the first)
14) Ovenbird
15) Bay-breasted Warbler (adult in basic plumage)
16) Cape May Warbler (first-year female)
17) Blackpoll Warbler (adult in basic plumage)
18) Nashville Warbler
19) Tennessee Warbler
20) Yellow-rumped Warbler (juvenile)
21) Orange-crowned Warbler (first-year)