Adults are 12 cm long and weigh 12 g. They are mainly olive-grey on the head and upperparts with white underparts; they have brown eyes and the front of the face is light. There is a white supercilium. They have thick blue-grey legs and a stout bill. Western birds are generally smaller and have darker grey crowns.
Habitat and Distribution
Warbling Vireos' breeding habitat is open deciduous and mixed woods from Alaska to Mexico and the Florida Panhandle. They migrate to Mexico and Central America.
These birds forage for insects in trees, hopping along branches and sometimes hovering. They also eat berries, especially before migration and in winter
These birds often nest along streams. They make a deep cup nest suspended from a tree branch or shrub, placed relatively high in the east and lower in the west. The male helps with incubation and may sing from the nest.
Calls and Songs
Their song is a cheerful warble, similar to that of the Painted Bunting bird.