A small passerine bird from the family of the Old World flycatchers (body length: 15–17 cm, wingspan: 23–26 cm, weight: 16–27.5 g). The nightingale is a little larger than a sparrow. The upperparts are brown, with a russet tail fan and tail feathers, while the underparts are greyish beige, with a lighter throat. An inconspicuous light stripe runs across the brow. The sexes are similar in coloration. In the wild, it is often difficult to tell the common nightingale apart from the thrush nightingale; its tail is somewhat redder, while the lower part of the throat and breast are without visible vermiculation. The main difference is its song. The common nightingale has an uncommonly broad range of vocalization, switching between flute-like sounds, forceful raps, whistling and gurgling.