Warbler migration.

American Redstart, Rondeau Provincial Park, Ontario, Canada, May 22, 2019.

One of the many warbler species that pass through Rondeau during migration.
Setophaga ruticilla
American Redstarts flash the bright patches in its tail and wings. This seems to startle insect prey and give the birds an opportunity to catch them.
source - https://www.allaboutbirds.org/guide/American_Redstart/

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