Philadelphia vireo.



This migrating vireo that breeds in the boreal forest has stayed around long enough for me to suspect it will remain here for the summer.

In our yard at Rondeau Provincial Park, Ontario, Canada, May 26, 2025

Vireo philadelphicus

Philadelphia and Red-eyed Vireos sing very similar songs, with Red-eyed's usually sounding simpler and faster. As if to make matters more confusing, where these two species overlap on the nesting grounds, the Philadelphia Vireo may sing perfect imitations of Red-eyed song. These imitations, scientists speculate, might help the smaller Philadelphia to avoid aggression by the larger, heavier Red-eyed Vireo.

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