Cape White-eye
Zosterops virens
This species is about 12 cm long with rounded wings, strong legs, and a conspicuous ring of white feathers round the eyes. The upperparts are green, and the throat and vent are bright yellow. The members of the Z. v. capensis has a grey breast and belly, whereas Z. v. virens has a greenish-yellow breast and belly. They are very vocal, and constantly keep in touch with soft trilled pee, pree or pirreee call notes.
ID text from Wikipedia, CC BY-SA 4.0
Orange River White-eye
Zosterops pallidus
The sexes are alike and measure 10–13 cm from bill to tail tip. It has pale olive green upper part plumage, a yellow throat and supraloral stripe, and a tawny buff tone to the flanks and sides of breast, which is regionally diagnostic. The lore plumage and bare parts are black. The juvenile plumage is a pale version of the adult's, and the white eye-rings appear during the second month.
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: Cape White-eye and Orange River White-eye.