The Philadelphia vireo is most
commonly confused with the warbling vireo,
since both tend to have very subtle field markings, unlike the red-eyed
vireo (which has a strong black stripe over the eye), the white-eyed
vireo (which has striking white eyes and yellow spectacles), the blue-headed vireo (which has
a dark gray head), and the yellow-throated
vireo (which has yellow spectacles and a yellow throat and
breast). Whereas the warbling vireo has a slightly brownish head,
the Philadelphia often has more of a gray cast to its head. The
Philadelphia also tends to have a more prominent stripe through the eye
and more black and white visible between the eye and the beak, and
often has more
extensive yellow on the underside of the bird. Note that warbling
vireos breed locally at Magee Marsh and typically peak in numbers
during the second week of May, whereas the Philadelphias are more
common during the second half of May.
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