Budgerigars 16 Month 2012 Calendar. This calendar features the highly popular budgerigar more commonly referred to as the budgie. This bird is believed to have originated from Australia and originally belonged to the tribe of the broad-tailed parrots still found their today. Budgerigars usually measure approximately 18 cm long and weigh around 30 to 40 grams. Wild budgerigars have predominantly green under parts while their upperparts are crossed with black and yellow. The forehead and face is usually yellow in adults, and crossed black with yellow in young birds until they become full adults and gain their senior plumage which usually occurs around 3 to 4 months old. This colourful Budgerigar calendar is sure to delight any fan or keeper of this friendly and most popular domesticated bird!