What is the appropriate term for a young raptor that has been hatched but not yet fledged?

The appropriate term for a young raptor that has been hatched but has not yet fledged is "nestling." This term specifically refers to birds that are still in the nest, relying on their parents for food and care until they develop the feathers and strength necessary to leave the nest and begin flying. Nestlings are typically characterized by their helplessness and dependence on adult birds during this critical early stage of life.

In contrast, the other terms describe different stages or concepts regarding birds. "Haggard" refers to a wild bird that has been captured and kept for a while, sometimes used in the context of falconry to describe a bird that is older and possibly more difficult to train. "Imprint" refers to a specific process where a young bird becomes attached to and follows a caregiver, which can significantly influence its behavior and development. "Juvenile" describes a young bird that has fledged and is beginning to learn to hunt and survive on its own, but is past the nestling stage. Understanding these terms helps delineate various developmental phases in raptors.