subadults

/sʌbˈædʌlts/
noun
  1. Individuals (especially animals) that are no longer juvenile but not yet fully mature or adult.
    • Subadults in the wolf pack often help hunt while learning from the older members.
    • The zoo's new program focuses on caring for subadults that have left their mothers but are not ready to breed.
    • Marine biologists track subadults to understand how young sea turtles survive before reaching adulthood.
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