A sparrow built a nest in a pair of children's trousers hanging on a balcony in southern China's Chongqing.br br In the video, filmed on May 8, two baby sparrows are seen on the ground and a nest with two other sparrows sleeping inside can be seen in an infant's trousers.br br The trousers were hanging on the balcony for a month while the woman was on business trips before she noticed the nest.