European Greenfinch
Chloris chloris
The European greenfinch is 15 cm (5.9 in) long with a wingspan of 24.5 to 27.5 cm (9.6 to 10.8 in). It is similar in size and shape to a house sparrow, but is mainly green, with yellow in the wings and tail. The female and young birds are duller and have brown tones on the back. The bill is thick and conical. The song contains a lot of trilling and twittering interspersed with wheezes, and the male performs a "butterfly" display flight. Male greenfinches exhibit higher degrees of fluctuating asymmetry. Their bones are more susceptible to disruption during development than those of females.
ID text from Wikipedia, CC BY-SA 4.0

Yellow-breasted Greenfinch
Chloris spinoides
The yellow-breasted greenfinch is 12–14 cm (4.7–5.5 in) in length and weighs between 15 and 21 g (0.53 and 0.74 oz). It has a brown conical bill and bright yellow wing bars. The underparts are bright yellow. The sexes have similar plumage but the female is less brightly coloured.
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: European Greenfinch and Yellow-breasted Greenfinch.