Hooded warbler,

Rondeau Provincial Park, Ontario, Canada, May 10, 2017.


One of my favourite warblers, very striking when you see one in person
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 - allaboutbirds-org.

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