Red-eyed Vireo vs Yellow-green Vireo

In short

The Red-eyed Vireo and Yellow-green Vireo are similar in appearance but can be distinguished by eye color and subtle plumage differences. The Red-eyed Vireo has a distinctive red eye, whereas the Yellow-green Vireo has a dark eye. Both species have similar body shapes and sizes, but their vocalizations and habitats can also aid in identification.

Identification tips

• Eye color: Red-eyed Vireo has a red eye; Yellow-green Vireo has a dark eye.
• Facial markings: Look for the Red-eyed Vireo's distinct black-bordered white supercilium.
• Plumage tone: Yellow-green Vireo has a more olive crown and yellowish underparts.
• Song: Listen for the Red-eyed Vireo's repetitive song versus the Yellow-green Vireo's slower phrases.
• Habitat: Consider the location; Red-eyed Vireo is more northern, while Yellow-green Vireo favors tropical areas.

Size

Both species are similar in size, typical of vireos, with no significant differences in overall body structure.

Plumage

The Red-eyed Vireo has a gray crown with a white supercilium and a black border above the eye, while the Yellow-green Vireo has a more olive crown and lacks the sharp contrast of the Red-eyed's facial markings. The Yellow-green Vireo also has a more yellowish wash on its underparts.

Behaviour

Both species exhibit similar foraging behaviors typical of vireos, such as gleaning insects from foliage. No significant behavioral differences are noted in the sources.

Habitat

The Red-eyed Vireo is more commonly found in deciduous and mixed woodlands, while the Yellow-green Vireo prefers tropical and subtropical forests, often in more southern ranges.

Voice

The Red-eyed Vireo has a repetitive, monotonous song, often described as a series of short phrases. The Yellow-green Vireo's song is similar but typically slower and less repetitive.