1. Hatchling: This stage begins when the eagle hatches from its egg. It is completely dependent on its parents for food and protection.
2. Eaglet: This stage begins when the eaglet is about two months old and can fly short distances. It is still dependent on its parents for food but is learning to hunt.
3. Sub-adult: This stage begins when the eaglet is about one year old and can fly long distances. It is still dependent on its parents for some food but is learning to hunt independently.
4. Adult: This stage begins when the eagle is about four or five years old and reaches full maturity. It is now fully independent and can hunt successfully.