Why would a mother parakeet kill another grown female that shes been caged with for years?

A mother parakeet would not typically kill another grown female that she has been caged with for years. Parakeets are known to be social birds and generally get along well with each other. However, there are a few reasons why conflicts may arise:

Territory and space issues: Sometimes, overcrowding can lead to territorial disputes. Make sure the cage is large enough to accommodate all the birds comfortably.

Competition for resources: If there is not enough food and water for all the birds, it can lead to conflict. Ensure there are multiple food and water sources to avoid competition.

Mating and nesting behavior: During breeding season, male and female parakeets can become territorial and aggressive toward other birds. If the cage is not well-designed to accommodate multiple pairs, disputes can occur.

Age and health factors: Older birds or birds with health issues can become more irritable and aggressive. If you notice any changes in behavior or physical health, it is best to consult a veterinarian.

To resolve these issues, separate the birds involved in the conflict and rearrange the cage to provide more space and resources. Introducing new toys or perches can also help in enriching their environment and reducing boredom, which can contribute to aggression. Observe their behavior closely and take appropriate actions based on their specific situation to ensure the safety and well-being of all the birds.