The Budgerigar is a colourful parrot native to Australia. Its plumage is bright yellow and green, small in size, they?re roughly 18-20cm from top to tail, and weigh 30-40 g. Budgerigars have been bred in captivity since the 1850s and are now one of the world?s best known pet birds. The bird has been bred into a huge range of colours and patterns from mauve, olive and blue to pure white. But only yellow and green coloring is in the wild. Budgerigars are highly nomadic. They generally fly north during winter, covering significant distances as they migrate. Flocks follow rainfall and seasonally abundant seeding grasses. Flocks normally range from 3 to 100 birds, but after rainfall can number many thousands!