Red-eyed Vireo

The Red-eyed Vireo is one of the most abundant summer songbirds in North American deciduous forests, though it is far more often heard than seen. Spending its time high in the leafy canopy, this small, olive-and-white bird is famous for its relentless singing, sometimes producing up to 20,000 short song phrases in a single day, even through the heat of summer afternoons. Highly migratory, they travel thousands of miles each year between their North American breeding grounds and their wintering homes in the Amazon basin.

Identifying a Red-eyed Vireo relies on a mix of plumage details, facial patterns, and silhouette:

• Face Pattern: The head features a distinctive blue-gray crown bordered by a dark line. A prominent white stripe (supercilium) runs above the eye, bordered below by a dark line running directly through the eye.
• Eye Color: Adult birds possess distinct ruby-red irises, though this feature can be difficult to see without good lighting or binoculars. Immature birds during their first autumn have dark brown eyes.
• Plumage: The upperparts are a olive-green, while the underparts are clean, unmarked white. The flanks may show a very faint yellowish wash.
• Bill: The bill is relatively heavy, blue-gray, and ends in a tiny hook characteristic of vireos.

Similar Species

• Warbling Vireo: Lacks the dark borders on the eyebrow and has a much blanker, softer-looking face with an overall duller gray-brown coloration.
• Philadelphia Vireo: Displays much yellower underparts, particularly on the throat and breast, and lacks the bold, dark-bordered white eyebrow of the Red-eyed.
• Black-whiskered Vireo: Extremely similar but possesses a dark stripe (the mustache or malar stripe) running down from the corner of the lower bill.

During the breeding season, Red-eyed Vireos favor mature deciduous open woodlands, mixed deciduous-coniferous forests, and urban parks with tall shade trees. They prefer areas with a dense understory for nesting, but forage high in the forest crown.

Range and Migration

• Breeding Range: Spreads widely across southern Canada and throughout the eastern and midwestern United States, extending northwest into parts of Washington, Oregon, and Idaho.
• Wintering Range: They are long-distance Neotropical migrants, wintering entirely in northern South America, primarily within the canopy of the Amazon rainforest.
• Migration: They travel mostly at night in spring and fall, often forming loose, mixed-species flocks with warblers, tanagers, and other vireos.

Feeding Behavior

Red-eyed Vireos are methodical searchers. Unlike frantic, fast-moving warblers, they move deliberately along branches, carefully scanning the undersides of leaves for caterpillars, beetles, and other insects. During late summer and on their wintering grounds, they supplement their insect diet heavily with various small fruits and berries.

Song and Call

Often nicknamed the "preacher bird," this species sings persistently. The song consists of brief, two-to-three-note whistled phrases delivered with a short pause in between, sounding like a repetitive conversation: "look up... over here... see me... up canopy..."

Breeding and Nesting

• Nest: The female builds an elegant, cup-shaped nest suspended by its rim from a horizontal fork of a low tree branch. The nest is woven from grasses, rootlets, strips of bark, and held together with sticky spider webs.
• Clutch Size: Typically 3 to 5 white eggs, lightly speckled with brown or black.