Budgerigar Melopsittacus undulatus

Budgerigars
Budgerigars
The Budgerigar, usually called Budgie, is a common wild small parrot throughout most of Australia, including the arid inland. It is also a common pet/aviary bird worldwide. The natural plumage is green front/body with yellow face/head and dark grey/black barring with "scalloped" black wing feathers edged in pale yellow (similar to the bird on the far right).
Budgerigars
Budgerigars
Many other colours have been bred in captivity. The male has a blue "cere" (nostrils) and the female has a pink or horn-coloured cere.
Three's a crowd
Budgerigars
Budgerigar pair
Three's a crowd. Captive bred birds, particularly show birds, are much larger than wild birds.
Budgies
Budgerigar green
Budgie blue
Bright green is a popular aviculture colouring, usually retaining the yellow face and dark scalloping of the natural plumage - close to the wild colouring.
Budgie blue
Budgerigar blue
Budgie white with blue
Various blues, often with a white face and crown, are another favourite.
Budgie turquoise
Budgerigar blue
Turquoise blue is one on the most popular colours, usually with a white face
Budgie
but sometimes with pale yellow.
Budgie yellow
Budgerigar
Canary yellow is another of the most popular colours, either retaining the black barring/scalloping
Budgie
or sometimes pure yellow without barring.
Budgie - white Other colours include white
(this one with a pale blue back and some grey mottling),
Budgerigar grey grey
Budgerigar brown and even pink and brown.