Need reasons why female budgies suddenly get aggressive and bite and tips how to stop it?

Female budgies may become aggressive and bite due to hormonal changes, territorial behavior, stress, or feeling threatened. To mitigate this aggression, ensure they have a spacious and enriching environment, provide plenty of social interaction, and handle them gently and consistently. Additionally, you can establish a routine to help them feel secure and consider consulting an avian vet if the behavior persists, as it may indicate health issues.