Brownies are part of the Girl Guides (or in the US, Girl Scouts) Organization for girls aged seven years old to ten years old. Brownies, were started by Lord Baden-Powell in 1914. Originally they were called Rosebuds, but were renamed by Baden-Powell after the girls had complained that they didn't like their name. Their name comes from the story "The Brownies" by Juliana Horatia Ewing, written in 1870. In the story two children learn that children can be helpful brownies instead of being lazy.

Brownies work in small groups called sixes. Each six is either named after Fairies or woodland creatures and is led by a Sixer and has a Second as deputy. Brownies work towards interest badges which require the girls to complete many different activities.

Traditionally, the adult leader in charge is called Brown Owl with other leaders being named after different owls.

More Info: en.m.wikipedia.org