The Philadelphia Vireo (Vireo philadelphicus), is a small songbird found on edges of deciduous and mixed woods across Canada. They migrate to Mexico and Central America. Although they are named Philadelphia Vireo, this bird does not occur in Philadelphia, except during migration.
Adults are mainly olive-brown on the upperparts with yellow underparts; they have dark eyes and a grey crown. There is a dark line through the eyes and a white stripe just over them. They have thick blue-grey legs and a stout bill.
They make a basket-shaped cup nest in a fork of a tree branch, usually placed relatively high. They forage for insects in trees, sometimes hovering or flying to catch insects in flight. They also eat berries, especially before migration.