The house sparrow (Passer domesticus) is one of Britain's most well-known and best-loved birds. Both sexes have a brown back streaked with black. Males and females are easily distinguished; males have a black bib, a grey crown with chestnut sides, and white cheeks. Females and juveniles have a duskier appearance, and lack the black bib seen in males. It is a very vocal species, producing a great range of familiar chattering and chirping, and a 'cher'r'r' when squabbling.