Atlantic Canary
Serinus canaria
The Atlantic canary can range from 10 to 12 cm (3.9 to 4.7 in) in length, with a wingspan of 21 to 23.7 cm (8.3 to 9.3 in) and a weight of 8.4 to 24.3 g (0.30 to 0.86 oz), with an average of around 15 g (0.53 oz). The male has a largely yellow-green head and underparts with a yellower forehead, face and supercilium. The lower belly and undertail-coverts are whitish and there are some dark streaks on the sides. The upperparts are grey-green with dark streaks and the rump is dull yellow. The female is similar to the male but duller with a greyer head and breast and less yellow underparts.
ID text from Wikipedia, CC BY-SA 4.0
European Serin
Serinus serinus
The European serin is a small short-tailed bird, 11–12 cm in length. The upper parts are dark-streaked greyish green, with a yellow rump. The yellow breast and white belly are also heavily streaked. The male has a brighter yellow face and breast, yellow wing bars and yellow tail sides. The song of this bird is a buzzing trill, very familiar in Mediterranean countries. It breeds across southern and central Europe and North Africa. Southern and Atlantic coast populations are largely resident, but the northern breeders migrate further south in Europe for the winter.
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: Atlantic Canary and European Serin.