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.
Users without a subscription are not able to see the full content. Please,
or login to access all content.