Answer: The antagonist of the story is the boy's regret of going on his first solo hike, without paying attention when his father told him how to read the position of the sun.
Explanation: The story of "The nest" is about a boy who gets lost in the woods. He gets frightened at the idea of never finding his family again. With struggle and vanishing hope, he fights the only antagonist throughout his journey; his own regret. The boy realizes that deciding to go on an adventure by himself, without having paid attention to what his father's advice was in case he got lost, was an unfortunate idea.