structural:summarization, linguistic:paraphrasing
Description

The common nightingale is slightly larger than the European robin, at 15–16.5 cm (5.9–6.5 in) length. It is plain brown above except for the reddish tail. It is buff to white below. The sexes are similar. The eastern subspecies (L. m. golzi) and the Caucasian subspecies (L. m. africana) have paler upper parts and a stronger face-pattern, including a pale supercilium. The song of the male nightingale has been described as one of the most beautiful sounds in nature, inspiring songs, fairy tales, opera, books, and a great deal of poetry. However, historically most people were not aware that female nightingales do not sing.