I originally wasn't going to make this because it's more or less one lump of colour, but decided to make a set of the three main breeds. And someone probably likes yellow Budgies enough to want a skin of one.

The yellow budgie is another result of artificial selection, where humans breed budgies over many generations to get a desirable trait. However, unlike blue budgies, yellow birds can occur in the wild. These birds would be very rare because it's a pigment mutation, similar to albinism. These yellow pigment mutations can occur in range of animals such as the Kea in NZ, Frogs and reptiles.

Unfortunately I have forgotten what this mutation is called and I can't find it anywhere. :(