Red-eyed Vireo

The Red-eyed Vireo is a small, plainly colored songbird best known not for its looks but for its extraordinary vocal endurance—males can sing thousands of short phrases in a single day, even through midday heat when most other birds fall silent. It is olive-green above and clean white below, with a distinctive head pattern: a blue-gray crown bordered by black lines, a bold white eyebrow stripe, and a dark line through the eye. Adults have a deep red iris, though this can be hard to see in the field and is brown in juveniles.

Despite being one of the most numerous songbirds in eastern North American forests during summer, its habit of staying high in the leafy canopy means it is heard far more often than seen.

Key field marks

• Gray crown bordered by black lines, bold white eyebrow stripe
• Dark eye line, red eye in adults (brown in juveniles)
• Olive-green back, clean white underparts
• No wing bars

Similar species

• Warbling Vireo: duller, less contrasty face pattern, dark eye, no black border on the crown.
• Philadelphia Vireo: yellow wash on the underparts, dark eye, less bold eyebrow.
• Blue-headed Vireo: bold white spectacles (not just an eyebrow), blue-gray head contrasting sharply with white throat, wing bars present.

Range and habitat

Red-eyed Vireo breeds across most of Canada and the eastern and northern United States in deciduous and mixed forests, favoring leafy canopy with a fairly open understory. It is one of the most abundant breeding songbirds across much of its range.

Migration

A long-distance migrant, wintering primarily in the Amazon basin of South America—one of the longest migrations of any North American songbird.

Behavior

Red-eyed Vireos forage methodically and somewhat slowly through the mid- to upper canopy, gleaning insects and caterpillars from leaves; they are less active and flitty than warblers.

Voice

The song is a monotonous, endlessly repeated series of short robin-like phrases, often described as the bird asking and answering questions: "Here I am... where are you... over here... see me?" It can be sung thousands of times a day, earning the nickname "preacher bird."

Feeding

Caterpillars and other insects make up the bulk of the summer diet; the birds shift toward berries and small fruit in fall to fuel migration.

Nesting and breeding

Builds a neat hanging cup nest suspended from a forked branch, well concealed in foliage. The female incubates 3-4 eggs for about 12-14 days; Red-eyed Vireo nests are frequent targets of Brown-headed Cowbird parasitism.