Nov 20, 2021
Unidentified bird, Assiniboine Park, early October 2021.
Small (sparrow-sized). Yellow-olive all over, brighter yellow belly. White and black wing bars. White eye ring.
Possibly a Ruby-crowned Kinglet, but I don’t think this bird was small enough.
Possibly a Blue-headed Vireo, but the belly wasn’t yellow enough.
Possibly a Cassin's Vireo--but they don’t come nearly far east enough.