The Blue-headed Vireo is the easternmost form in the "Solitary Vireo" complex. Formerly considered one species, three species now are recognized. In appearance it is the most brightly colored of the three.

The Blue-headed Vireo is the only vireo within its range that makes extensive use of coniferous forests, although it also occupies deciduous habitats.

The oldest recorded Blue-headed Vireo was at least 6 years, 5 months old. It was banded in Ontario and found in Guatemala.

https://www.allaboutbirds.org/guide/Blue-headed_Vireo/overview