Breeding males have a bright orange face and throat and forage high in leafy forest canopies.
Adult males in breeding plumage have a vivid orange face and throat. Females and young birds have a more yellowish throat.
Blackburnian Warblers pass through the Thunder Bay region of northwestern Ontario during spring migration. Researchers combined historical bird observations and banding records to study first-arrival dates for 190 species. The spring-arrival analysis for migratory birds used local records from 1951 to 2020.
In the Thunder Bay series, Blackburnian Warbler first-arrival dates advanced by about 0.13 days per decade. The study also reported changes in first arrival for other New World warblers passing through the area, creating a basis for regional comparisons.
An extinction-risk assessment has not been added yet.
In the 1951–2020 Thunder Bay records, Blackburnian Warbler first arrival advanced by about 0.13 days per decade. Comparing similar long-term records from other regions can reveal where migration timing changes differ.