Budgerigars grow to an average height of 18 cm (7 in) long in Australia and weigh 30–40 grams. The wild Australian Budgies shows a light green body color (abdomen and rumps), while their mantle (back and wing coverts) display pitch-black mantle markings (blackish in fledglings and immature) edged in clear yellow undulations. The forehead and face is yellow in adults but with blackish stripes down to the cere (nose) in young individuals until they change into their adult plumage around 3–4 months of age. They display small, purple patches (called cheek patches) and a series of three black spots across each sides of their throats (called throat-spots). The two outermost throat-spots are situated at the base of each cheek-patch.
The tail is cobalt (dark-blue); outside tail feathers display central yellow flashes. Their wings have greenish-black flight feathers and black coverts with yellow fringes along with central yellow flashes, which only becomes visible in flight or when the wings are outstretched. Bills are olive grey and legs blueish-grey, with zygodactyl toes.
The upper half of their beaks is much taller than the bottom half and covers the bottom when closed. The beak does not protrude much, due to the thick, fluffy feathers surrounding it, giving the appearance of a downward-pointing beak that lies flat against the face. The upper half acts as a long, smooth cover, while the bottom half is just about a half sized cup-piece. These beaks allow the bird to eat plants, fruits, and vegetables. The beak of a budgerigar can clamp tighter than most other birds, keeping food or nesting supplies from falling out of its hold.
Source:Wikipedia
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