Answer:
Donny must learn to fly
Step-by-step explanation:
The first paragraph mentions Donny's inability to fly, despite all attempts to learn, even trying to imitate the other birds. It is related to the second paragraph, in the aspect that, as winter approaches, it becomes a necessity for Donny to learn to fly. If Donny does not learn to fly it would become a burden for the other birds when migrating south, Donny runs the risk of dying in the cold winter but learns to fly.