Possible Clues:

• Develop wing feathers
• Develop flight feathers
• Grow feathers
• Grow feathers large enough for flight
• Take first flight from Liechtenstein border
• Raise and care for chick starting to fly over ridge
• Fulmar originally left by top of cliff to get ready to fly
• Bring up until able to fly, as a bird
• Prepare for a first flight, as a bird
• (Of a bird) develop wing feathers