Hooded warbler
Not much activity this time of year so here is one from the archives.
Setophaga citrina
The white spots on a Hooded Warbler's tail help them capture more insects, possibly by startling the insects into taking flight. An experimental study conducted in Pennsylvania found that birds with temporarily darkened tail feathers were less successful at capturing insects than those with white spots on their tails.
source- Cornell Lab of Ornithology.
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