Hi marcio
Hope this helps:
Nightingale - Wikipedia, the free encyclopedia
The Nightingale is slightly larger than the
European Robin, at 15-16.5 cm length. It is plain brown above except for the reddish tail. It is buff to white below. Sexes are similar.
Nightingales are named so because they frequently sing at night as well as during the day. The name has been used for well over 1,000 years, being highly recognizable even in its Anglo-Saxon form - 'nihtingale'. It means 'night songstress'.
Early writers assumed the female sang; in fact, it is the male. The male nightingale is known for his singing, to the extent that human singers are sometimes admiringly referred to as nightingales; the song is loud, with an impressive range of whistles, trills and gurgles. Its song is particularly noticeable at night because few other birds are singing. PS There's a famous old song called: "A nightingale sang in Berkley Square" (London).