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A photo of a Philadelphia Vireo (Vireo philadelphicus)
Philadelphia Vireo

Philadelphia Vireo

Vireo philadelphicus

The Philadelphia vireo, a small songbird of the Vireonidae family, presents a subtle charm with its olive-brown upperparts and vibrant yellow underparts. A grey crown adorns its head, while dark eyes peer out, accentuated by a dark line through them and a contrasting white stripe above. Noticeably, this bird lacks wing bars and an eye ring, but it does boast thick blue-grey legs and a stout bill, giving it a robust appearance for its size.

Identification Tips

When attempting to distinguish the Philadelphia vireo from its avian kin, pay special attention to the underparts, which gleam with a yellow hue, and the dark lores that set it apart from the similar warbling vireo. Its stout bill and blue-grey legs are also key features to note.

Habitat

The preferred breeding grounds of the Philadelphia vireo are the edges of deciduous and mixed woods across the vast expanse of Canada, where they craft their nests with care.

Distribution

As the seasons turn, these birds embark on a migratory journey to the warmer climes of Mexico and Central America. Although named after the city of Philadelphia, they are but rare visitors there, passing through only during migration.

Behaviour

In their quest for sustenance, Philadelphia vireos can be observed foraging for insects amidst the tree canopies, often displaying a remarkable agility as they hover or take flight to snatch their prey from the air. Berries too form a part of their diet, particularly as they fuel up for their migratory travels.

Song & Calls

The vocal repertoire of the Philadelphia vireo consists of a series of three to five notes, reminiscent of a weeezh weeezh weeezh. Their song bears a striking resemblance to that of the red-eyed vireo, yet it is distinguished by slightly longer pauses between phrases and a tendency towards higher pitches.

Breeding

During the breeding season, these birds demonstrate a preference for high placement of their basket-shaped cup nests, which they situate in a fork of a tree branch. Both parents share the duty of incubation, which lasts up to 14 days, over their clutch of 3 to 5 lightly spotted white eggs.

Diet and Feeding

The diet of the Philadelphia vireo is primarily insectivorous, but they do not shy away from augmenting their meals with berries, especially when the time comes to build up energy reserves for their migratory journey.

Conservation status

The Philadelphia vireo is currently classified as Least Concern by the IUCN, indicating that, for now, this species does not face immediate threats to its survival.

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