Red-eyed vireo.
Seems to be unhappy with something or he is signing on territory.
Rondeau Provincial Park, Ontario, Canada, August 27, 2021.
Vireo olivaceus
On May 27, 1952, Louise de Kiriline Lawrence counted the number of songs sung by a single Red-eyed Vireo seeking a mate on his territory 180 miles north of Toronto. He sang 22,197 songs in the 14 hours from just before dawn to evening, singing for 10 of those hours.
source-allaboutbirds-org.
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