Feather duster budgerigars sometimes called mops, are budgerigars that have a genetic condition characterised by overly long feathers that do not stop growing, giving the bird the appearance of a feather duster. This condition is sometimes known as chrysanthemum feathering. The feathers do not have the necessary barbs and barbules for the feather’s structure to interlock. The feather shaft is also curved, and so the feathers appear deformed and fluffed out. Individuals with this condition often appear less alert than nest mates.
They lack vigour, often cannot fly, and usually die within a year of hatching. There is no treatment.