The song thrush (Turdus philomelos) is a thrush that breeds across much of Eurasia. It has brown upperparts and black-spotted cream or buff underparts and has three recognised subspecies. Its distinctive song, which has repeated musical phrases, has frequently been referred to in poetry.
The song thrush (as represented by the nominate subspecies T. p. philomelos) is 20 to 23.5 centimetres (8 to 9.25 in) in length and weighs 50–107 grammes (1.8 to 3.8 oz). The sexes are similar, with plain brown backs and neatly black-spotted cream or yellow-buff underparts, becoming paler on the belly. The underwing is warm yellow, the bill is yellowish and the legs and feet are pink. The upperparts of this species become colder in tone from west to east across the breeding range from Sweden to Siberia. The juvenile resembles the adult, but has buff or orange streaks on the back and wing coverts.
The most similar European thrush species is the redwing (T. iliacus), but that bird has a strong white supercilium, red flanks, and shows a red underwing in flight. The mistle thrush (T. viscivorus) is much larger and has white tail corners, and the Chinese thrush (T. mupinensis), although much more similar in plumage, has black face markings and does not overlap in range.