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1 To reach the stage in the growth of a young bird at which its flight muscles and feathers have developed sufficiently for it to be capable of flying.

2 To raise a young bird until it is fully grown.

3 To reach the stage in its development at which a young bird leaves the nest, whether or not it can fly.

4 To raise a young bird to a stage at which it can leave its parents and live independently.

Subjects: Zoology and Animal Sciences.

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