Red-eyed Vireo
Vireo olivaceus
Voice: Red-eyed vireos are one of the most prolific singers in the bird world. They usually sing high up in trees for long periods of time in a question-and-answer rhythm. This species holds the record for most songs given in a single day among bird species, with more than 20,000 songs in one day. Songs generally consist of 1–5 syllables between 2 and 6 kHz. Songs are usually spaced 0.
ID text from Wikipedia, CC BY-SA 4.0
White-eyed Vireo
Vireo griseus
Measurements: Length: 4.3–5.1 in (11–13 cm) Weight: 0.3–0.5 oz (10–14 g) Wingspan: 6.7 in (17 cm) Its head and back are a greyish olive, and the underparts are white with yellow flanks. The wings and tail are dark, and there are two white wing bars on each wing. The eyes have white irises, and are surrounded by yellow spectacles. Sexes are similar. Voice: The white-eyed vireo's song is highly variable, consisting of a rapid series of notes bookended by sharp 'chip' notes.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Red-eyed Vireo and White-eyed Vireo.