genetic mutations

Hello, my pets decided to have babies. I am very curious about their color mutation. Parents are what I think a yellowsided dilute and a pineapple (I will attach pic). Three of the babies I think they are like dad (yellosided dilutes) and one looks like a normal green cheek. Is this possible? No...

Hi all, I have a mates pair of budgies who have hatched and raised two clutches of chicks. The oldest clutch are 1 year old, and the youngest are 6 months old. Recently I have noticed a trend of sorts in the plumage of a couple of the babies. There are a total of 5 birds from the same parents...