Social Bonding: Preening is a social activity for budgies. When they preen each other, they are strengthening their bonds and expressing their affection.
Hygiene: Budgies have feathers all over their bodies, some of which are difficult for them to reach on their own. By preening each other, they can help keep each other clean and free of dirt, debris, and parasites.
Feather Maintenance: Preening helps to keep budgies' feathers in good condition. It removes any broken or damaged feathers, and helps to distribute natural oils throughout the plumage, which keeps it waterproof and healthy.
Communication: Preening can also serve as a form of communication between budgies. When one budgie preens another, it is a way of showing that it is friendly and non-threatening. It can also be a sign of dominance or courtship.
Stress Relief: Preening each other can be a soothing and relaxing activity for budgies. It helps to reduce stress and promote a sense of well-being.
In summary, preening is an important part of budgie behavior and serves multiple purposes, including social bonding, hygiene, feather maintenance, communication, and stress relief.