Which of the following best describes a brancher?

A brancher is a stage in a juvenile raptor's development where it is learning to fly, typically after leaving the nest but before it is fully capable of sustained flight. During this phase, the young bird is often seen perched on branches near its nest and may practice flapping its wings and taking short flights. This stage is crucial for the bird as it develops the necessary skills for flying, hunting, and eventually living independently.

Options referring to a juvenile raptor that cannot fly or a young bird still in the nest do not accurately describe a brancher, as these refer to earlier stages of development. The option about an adult bird training its young is unrelated to the definition of a brancher, as it focuses on the adult's role rather than the specific developmental stage of the juvenile bird.