“They were beckoning to him, calling shrilly.” Why did the seagull’s father and mother threaten him and cajole him to fly?

The young seagull was afraid to fly as he thought that his wings would not support him. His two brothers and his sister had already flown away the day before and so, he was left alone and hungry on the ledge. His father and mother threatened to starve him on the ledge and cajoled him to fly because learning the art of flight was very necessary for a bird. But the young seagull was too timid to fly.